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Eternal youth is the concept of human physical immortality free of ageing. The youth referred to is usually meant to be in contrast to the depredations of aging, rather than a specific age of the human lifespan. Eternal youth is common in mythology, and is a popular theme in fiction.

Religion and mythology

Eternal youth is a characteristic of the inhabitants of Paradise in Abrahamic religions.

The Hindus believe that the Vedic and the post-Vedic rishis have attained immortality, which implies the ability to change one's body's age or even shape at will. These are some of the siddhas in Yoga. Markandeya is said to always stay at the age of 16.

The difference between eternal life and the more specific eternal youth is a recurrent theme in Greek and Roman mythology. The mytheme of requesting the boon of immortality from a god, but forgetting to ask for eternal youth appears in the story of Tithonus. A similar theme is found in Ovid regarding the Cumaean Sibyl.

In Norse mythology, Iðunn is described as providing the gods apples that grant them eternal youthfulness in the 13th-century Prose Edda.

Telomeres

An individual's DNA plays a role in the aging process. Aging begins even before birth, as soon as cells start to die and need to be replaced. On the ends of each chromosome are repetitive sequences of DNA, telomeres, that protect the chromosome from joining with other chromosomes, and have several key roles. One of these roles is to regulate cell division by allowing each cell division to remove a small amount of genetic code. The amount removed varies by the cell type being replicated. The gradual degradation of the telomeres restricts cell division to 40–60 times, also known as the Hayflick limit. Once this limit has been reached, more cells die than can be replaced in the same time span. Thus, soon after this limit is reached the organism dies. The importance of telomeres is now clearly evident: lengthen the telomeres, lengthen the life.^[1]

However, a study of the comparative biology of mammalian telomeres indicated that telomere length correlates inversely, rather than directly, with lifespan, and concluded that the contribution of telomere length to lifespan remains controversial.^[2] Also, telomere shortening does not occur with age in some postmitotic tissues, such as in the rat brain.^[3] In humans, skeletal muscle telomere lengths remain stable from ages 23–74.^[4] In baboon skeletal muscle, that consists of fully differentiated post-mitotic cells, less than 3% of myonuclei contain damaged telomeres and this percentage does not increase with age.^[5] Thus telomere shortening does not appear to be a major factor in the aging of the differentiated cells of brain or skeletal muscle.

Studies have shown that 90 percent of cancer cells contain large amounts of an enzyme called telomerase.^[6] Telomerase is an enzyme that replenishes the worn away telomeres by adding bases to the ends and thus renewing the telomere. A cancer cell has in essence turned on the telomerase gene, and this allows them to have an unlimited amount of divisions without the telomeres wearing away. Other kinds of cells that can surpass the Hayflick limit are stem cells, hair follicles, and germ cells.^[7] This is because they contain raised amounts of telomerase.

Therapy

The idea that the human body can be repaired in old age to a more youthful state has gathered significant commercial interest over the past few years, including by companies such as Human Longevity Inc, Google Calico, and Elysium Health.^[8]^[9]^[10] In addition to these larger companies, many startups are currently developing therapeutics to tackle the 'ageing problem' using therapy.^[11]^[12] In 2015 a new class of drugs senolytics was announced (currently in pre-clinical development) designed specifically to combat the underlying biological causes of frailty.^[13]

Philanthropy

The "loss of youth" or ageing process is responsible for increasing the risk of individuals to many diseases including cancer, Parkinson's, Alzheimer's, and others. As a result, in recent years, many high net worth individuals have donated large amounts of their money towards initiatives towards scientific research into the ageing process itself or therapies to slow or reverse the ageing process.^[14] These people include Jeff Bezos, Ray Kurzweil, Peter Thiel,^[15] Aubrey de Grey, Larry Ellison, Sergey Brin, Dmitry Itskov, Paul Gallen,^[16] and Mark Zuckerberg.^[17]

References

^ Lee J. Siegel. "ARE TELOMERES THE KEY TO AGING AND CANCER?". Archived from the original on 2013-01-20.
^ Gomes NM, Ryder OA, Houck ML, Charter SJ, Walker W, Forsyth NR, Austad SN, Venditti C, Pagel M, Shay JW, Wright WE (2011). "Comparative biology of mammalian telomeres: hypotheses on ancestral states and the roles of telomeres in longevity determination". Aging Cell. 10 (5): 761–768. doi:10.1111/j.1474-9726.2011.00718.x. PMC 3387546. PMID 21518243.
^ Cherif H, Tarry JL, Ozanne SE, Hales CN (2003). "Ageing and telomeres: a study into organ- and gender-specific telomere shortening". Nucleic Acids Res. 31 (5): 1576–1583. doi:10.1093/nar/gkg208. PMC 149817. PMID 12595567.
^ Renault V, Thornell LE, Eriksson PO, Butler-Browne G, Mouly V (2003). "Regenerative potential of human skeletal muscle during aging". Aging Cell. 1 (2): 132–139. doi:10.1046/j.1474-9728.2002.00017.x. PMID 12882343. S2CID 7020102.
^ Jeyapalan JC, Ferreira M, Sedivy JM, Herbig U (2007). "Accumulation of senescent cells in mitotic tissue of aging primates". Mech Ageing Dev. 128 (1): 36–44. doi:10.1016/j.mad.2006.11.008. PMC 3654105. PMID 17116315.
^ Klaus Damm (2001). "A highly selective telomerase inhibitor limiting human cancer cell proliferation". The EMBO Journal. 20 (24): 6958–6968. doi:10.1093/emboj/20.24.6958. PMC 125790. PMID 11742973.
^ Peter J. Hornsby (2007). "Telomerase and the aging process". Experimental Gerontology. 42 (7): 575–81. doi:10.1016/j.exger.2007.03.007. PMC 1933587. PMID 17482404.
^ "Former unicorn genetics startup Human Longevity loses its horn". 2018-12-11. Retrieved December 26, 2018.
^ "Google's Long, Strange Life-Span Trip". Retrieved December 26, 2018.
^ "The Anti-Aging Pill". Retrieved December 26, 2018.
^ "Esthechoc: Scientists invent 'anti-ageing' chocolate".
^ "Startup Alkahest inks a $50M deal for anti-aging R&D".
^ "New "Senolytic" Drugs Can Dramatically Increase Healthy Lifespan". 11 March 2015.
^ Wallace, Benjamin (August 23, 2016). "An MIT Scientist Claims That This Pill Is the Fountain of Youth". New York Magazine.
^ "Billionaire Peter Thiel embarks on anti-aging crusade".
^ "These Tech Billionaires Are Determined to Buy Their Way Out of Death". Business Insider.
^ "Zuckerberg, Brin join forces to extend life". February 20, 2013. Retrieved August 8, 2016.

[Siegel-1] Lee J. Siegel. "ARE TELOMERES THE KEY TO AGING AND CANCER?". Archived from the original on 2013-01-20.

[2] Gomes NM, Ryder OA, Houck ML, Charter SJ, Walker W, Forsyth NR, Austad SN, Venditti C, Pagel M, Shay JW, Wright WE (2011). "Comparative biology of mammalian telomeres: hypotheses on ancestral states and the roles of telomeres in longevity determination". Aging Cell. 10 (5): 761–768. doi:10.1111/j.1474-9726.2011.00718.x. PMC 3387546. PMID 21518243.

[3] Cherif H, Tarry JL, Ozanne SE, Hales CN (2003). "Ageing and telomeres: a study into organ- and gender-specific telomere shortening". Nucleic Acids Res. 31 (5): 1576–1583. doi:10.1093/nar/gkg208. PMC 149817. PMID 12595567.

[4] Renault V, Thornell LE, Eriksson PO, Butler-Browne G, Mouly V (2003). "Regenerative potential of human skeletal muscle during aging". Aging Cell. 1 (2): 132–139. doi:10.1046/j.1474-9728.2002.00017.x. PMID 12882343. S2CID 7020102.

[5] Jeyapalan JC, Ferreira M, Sedivy JM, Herbig U (2007). "Accumulation of senescent cells in mitotic tissue of aging primates". Mech Ageing Dev. 128 (1): 36–44. doi:10.1016/j.mad.2006.11.008. PMC 3654105. PMID 17116315.

[Damm-6] Klaus Damm (2001). "A highly selective telomerase inhibitor limiting human cancer cell proliferation". The EMBO Journal. 20 (24): 6958–6968. doi:10.1093/emboj/20.24.6958. PMC 125790. PMID 11742973.

[Hornsby-7] Peter J. Hornsby (2007). "Telomerase and the aging process". Experimental Gerontology. 42 (7): 575–81. doi:10.1016/j.exger.2007.03.007. PMC 1933587. PMID 17482404.

[8] "Former unicorn genetics startup Human Longevity loses its horn". 2018-12-11. Retrieved December 26, 2018.

[9] "Google's Long, Strange Life-Span Trip". Retrieved December 26, 2018.

[10] "The Anti-Aging Pill". Retrieved December 26, 2018.

[11] "Esthechoc: Scientists invent 'anti-ageing' chocolate".

[12] "Startup Alkahest inks a $50M deal for anti-aging R&D".

[13] "New "Senolytic" Drugs Can Dramatically Increase Healthy Lifespan". 11 March 2015.

[14] Wallace, Benjamin (August 23, 2016). "An MIT Scientist Claims That This Pill Is the Fountain of Youth". New York Magazine.

[15] "Billionaire Peter Thiel embarks on anti-aging crusade".

[16] "These Tech Billionaires Are Determined to Buy Their Way Out of Death". Business Insider.

[17] "Zuckerberg, Brin join forces to extend life". February 20, 2013. Retrieved August 8, 2016.

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@@ Line 1: / Line 1: @@
 {{Redirect-distinguish|Youth serum|Truth serum}}
+{{short description|Physical immortality free of ageing}}
-{{Other uses}}
-{{Refimprove|date=December 2009}}
+{{More citations needed|date=December 2009}}
 [[Image:Youth and Time 1901.jpg|thumb|''Youth and Time'', [[John William Godward]], 1901]]
-'''Eternal youth''' is the concept of human physical [[immortality]] free of [[ageing]]. The [[youth]] referred to is usually meant to be in contrast to the depredations of aging, rather than a specific age of the human lifespan. Achieving eternal youth so far remains beyond the capabilities of scientific technology. However, much research is being conducted in the sciences of genetics which may allow manipulation of the aging process in the future.{{citation needed|date=November 2010}} Eternal youth is common in mythology, and is a popular theme in [[fiction]].
+'''Eternal youth''' is the concept of human physical [[immortality]] free of [[ageing]]. The [[youth]] referred to is usually meant to be in contrast to the depredations of aging, rather than a specific age of the human lifespan. Eternal youth is common in mythology, and is a popular theme in [[fiction]].
-And myth is true fiction is fact in time changing and real is on film true is true myths are true and false is false 666 is a treasure and y'all think that the mark of the beast but your wrong the crucifix you were hoping put a curse on you cause you took the Lord's name in vain by saying jesus died for your sins and that he is ransom for you to pass threw the geats to heaven
 ==Religion and mythology==
@@ Line 14: / Line 13: @@
 The difference between eternal life and the more specific eternal youth is a recurrent theme in [[Greek mythology|Greek]] and [[Roman mythology]]. The [[mytheme]] of requesting the boon of immortality from a god, but forgetting to ask for eternal youth appears in the story of [[Tithonus]]. A similar theme is found in [[Ovid]] regarding the [[Cumaean Sibyl]].
-In [[Norse mythology]], [[Iðunn]] is described as providing the gods [[apple]]s that grant them eternal youthfulness in the 13th century [[Prose Edda]].
+In [[Norse mythology]], [[Iðunn]] is described as providing the gods [[apple]]s that grant them eternal youthfulness in the 13th-century ''[[Prose Edda]]''.
 ==Telomeres==
-An individual's [[DNA]] plays a role in the aging process. Aging begins even before birth, as soon as cells start to die and need to be replaced. On the ends of each [[chromosome]] are repetitive sequences of DNA, [[telomeres]], that protect the chromosome from joining with other chromosomes, and have several key roles. One of these roles is to regulate cell division by allowing each cell division to remove a small amount of genetic code. The amount removed varies by the cell type being replicated. The gradual degradation of the telomeres restricts cell division to 40-60 times, also known as the [[Hayflick limit]]. Once this limit has been reached, more cells die than can be replaced in the same time span. Thus, soon after this limit is reached the organism dies. The importance of telomeres is now clearly evident: lengthen the telomeres, lengthen the life.<ref name="Siegel"/>
+An individual's [[DNA]] plays a role in the aging process. Aging begins even before birth, as soon as cells start to die and need to be replaced. On the ends of each [[chromosome]] are repetitive sequences of DNA, [[telomeres]], that protect the chromosome from joining with other chromosomes, and have several key roles. One of these roles is to regulate cell division by allowing each cell division to remove a small amount of genetic code. The amount removed varies by the cell type being replicated. The gradual degradation of the telomeres restricts cell division to 40–60 times, also known as the [[Hayflick limit]]. Once this limit has been reached, more cells die than can be replaced in the same time span. Thus, soon after this limit is reached the organism dies. The importance of telomeres is now clearly evident: lengthen the telomeres, lengthen the life.<ref name="Siegel"/>
-However, a study of the comparative biology of mammalian telomeres indicated that telomere length correlates inversely, rather than directly, with lifespan, and concluded that the contribution of telomere length to lifespan remains controversial.<ref>{{cite journal |vauthors=Gomes NM, Ryder OA, Houck ML, Charter SJ, Walker W, Forsyth NR, Austad SN, Venditti C, Pagel M, Shay JW, Wright WE | year = 2011 | title = Comparative biology of mammalian telomeres: hypotheses on ancestral states and the roles of telomeres in longevity determination | url = | journal = Aging Cell | volume = 10 | issue = 5| pages = 761–768 | doi = 10.1111/j.1474-9726.2011.00718.x | pmid = 21518243 | pmc=3387546}}</ref>  Also, telomere shortening does not occur with age in a some postmitotic tissues, such as in the rat brain.<ref>{{cite journal |vauthors=Cherif H, Tarry JL, Ozanne SE, Hales CN | year = 2003 | title = Ageing and telomeres: a study into organ- and gender-specific telomere shortening | journal = Nucleic Acids Res | volume = 31 | issue = 5| pages = 1576–1583 | doi = 10.1093/nar/gkg208 | pmid = 12595567 | pmc=149817}}</ref>  In humans, skeletal muscle telomere lengths remain stable from ages 23–74.<ref>{{cite journal |vauthors=Renault V, Thornell LE, Eriksson PO, Butler-Browne G, Mouly V | year = 2003 | title = Regenerative potential of human skeletal muscle during aging | url = | journal = Aging Cell | volume = 1 | issue = 2| pages = 132–139 | pmid = 12882343 | doi=10.1046/j.1474-9728.2002.00017.x}}</ref> In baboon skeletal muscle, that consists of fully differentiated post-mitotic cells, less than 3% of myonuclei contain damaged telomeres and this percentage does not increase with age.<ref>{{cite journal |vauthors=Jeyapalan JC, Ferreira M, Sedivy JM, Herbig U | year = 2007 | title = Accumulation of senescent cells in mitotic tissue of aging primates | journal = Mech Ageing Dev | volume = 128 | issue = 1| pages = 36–44 | doi = 10.1016/j.mad.2006.11.008 | pmid = 17116315 | pmc=3654105}}</ref>  Thus telomere shortening does not appear to be a major factor in the aging of the differentiated cells of brain or skeletal muscle.
+However, a study of the comparative biology of mammalian telomeres indicated that telomere length correlates inversely, rather than directly, with lifespan, and concluded that the contribution of telomere length to lifespan remains controversial.<ref>{{cite journal |vauthors=Gomes NM, Ryder OA, Houck ML, Charter SJ, Walker W, Forsyth NR, Austad SN, Venditti C, Pagel M, Shay JW, Wright WE | year = 2011 | title = Comparative biology of mammalian telomeres: hypotheses on ancestral states and the roles of telomeres in longevity determination | journal = Aging Cell | volume = 10 | issue = 5| pages = 761–768 | doi = 10.1111/j.1474-9726.2011.00718.x | pmid = 21518243 | pmc=3387546}}</ref>  Also, telomere shortening does not occur with age in some postmitotic tissues, such as in the rat brain.<ref>{{cite journal |vauthors=Cherif H, Tarry JL, Ozanne SE, Hales CN | year = 2003 | title = Ageing and telomeres: a study into organ- and gender-specific telomere shortening | journal = Nucleic Acids Res | volume = 31 | issue = 5| pages = 1576–1583 | doi = 10.1093/nar/gkg208 | pmid = 12595567 | pmc=149817}}</ref>  In humans, skeletal muscle telomere lengths remain stable from ages 23–74.<ref>{{cite journal |vauthors=Renault V, Thornell LE, Eriksson PO, Butler-Browne G, Mouly V | year = 2003 | title = Regenerative potential of human skeletal muscle during aging | journal = Aging Cell | volume = 1 | issue = 2| pages = 132–139 | pmid = 12882343 | doi=10.1046/j.1474-9728.2002.00017.x| s2cid = 7020102 | doi-access =  }}</ref> In baboon skeletal muscle, that consists of fully differentiated post-mitotic cells, less than 3% of myonuclei contain damaged telomeres and this percentage does not increase with age.<ref>{{cite journal |vauthors=Jeyapalan JC, Ferreira M, Sedivy JM, Herbig U | year = 2007 | title = Accumulation of senescent cells in mitotic tissue of aging primates | journal = Mech Ageing Dev | volume = 128 | issue = 1| pages = 36–44 | doi = 10.1016/j.mad.2006.11.008 | pmid = 17116315 | pmc=3654105}}</ref>  Thus telomere shortening does not appear to be a major factor in the aging of the differentiated cells of brain or skeletal muscle.
 Studies have shown that 90 percent of [[cancer]] cells contain large amounts of an [[enzyme]] called [[telomerase]].<ref name="Damm"/> Telomerase is an enzyme that replenishes the worn away telomeres by adding bases to the ends and thus renewing the telomere. A cancer cell has in essence turned on the telomerase gene, and this allows them to have an unlimited amount of divisions without the telomeres wearing away. Other kinds of cells that can surpass the Hayflick limit are [[stem cells]], [[hair follicles]], and [[germ cells]].<ref name="Hornsby"/> This is because they contain raised amounts of telomerase.
 ==Therapy==
-The idea that the human body can be repaired in old age to a more youthful state has gathered significant commercial interest over the past few years, including by companies such as [[Human Longevity Inc]], [[Google Calico]], and [[Elysium Health]].{{citation needed|date=May 2016}} In addition to these larger companies, many startups are currently developing therapeutics to tackle the 'ageing problem' using therapy.<ref>{{cite news|title=Esthechoc: Scientists invent 'anti-ageing' chocolate|url=https://www.independent.co.uk/life-style/food-and-drink/news/esthechoc-scientists-invent-antiageing-chocolate-10060075.html}}</ref><ref>{{cite web|title=Startup Alkahest inks a $50M deal for anti-aging R&D|url=http://www.fiercebiotech.com/story/startup-alkahest-inks-50m-deal-anti-aging-rd/2015-03-04}}</ref> In 2015 a new class of drugs [[senolytics]] was announced (currently in pre-clinical development) designed specifically to combat the underlying biological causes of frailty.<ref>{{cite web|title=New "Senolytic" Drugs Can Dramatically Increase Healthy Lifespan|url=http://io9.com/new-senolytic-drugs-can-dramatically-increase-healthy-1690827868}}</ref>
+The idea that the human body can be repaired in old age to a more youthful state has gathered significant commercial interest over the past few years, including by companies such as [[Human Longevity Inc]], [[Google Calico]], and [[Elysium Health]].<ref>{{cite web|url=https://medcitynews.com/2018/12/former-unicorn-genetics-startup-human-longevity-loses-its-horn/|title=Former unicorn genetics startup Human Longevity loses its horn|access-date=December 26, 2018|date=2018-12-11}}</ref><ref>{{cite web|url=https://www.technologyreview.com/s/603087/googles-long-strange-life-span-trip/|title=Google's Long, Strange Life-Span Trip|access-date=December 26, 2018}}</ref><ref>{{cite web|url=https://www.technologyreview.com/s/534636/the-anti-aging-pill/|title=The Anti-Aging Pill|access-date=December 26, 2018}}</ref> In addition to these larger companies, many startups are currently developing therapeutics to tackle the 'ageing problem' using therapy.<ref>{{cite news|title=Esthechoc: Scientists invent 'anti-ageing' chocolate|url=https://www.independent.co.uk/life-style/food-and-drink/news/esthechoc-scientists-invent-antiageing-chocolate-10060075.html}}</ref><ref>{{cite web|title=Startup Alkahest inks a $50M deal for anti-aging R&D|url=http://www.fiercebiotech.com/story/startup-alkahest-inks-50m-deal-anti-aging-rd/2015-03-04}}</ref> In 2015 a new class of drugs [[senolytics]] was announced (currently in pre-clinical development) designed specifically to combat the underlying biological causes of frailty.<ref>{{cite web|title=New "Senolytic" Drugs Can Dramatically Increase Healthy Lifespan|date=11 March 2015 |url=http://io9.com/new-senolytic-drugs-can-dramatically-increase-healthy-1690827868}}</ref>
 ==Philanthropy==
-The "loss of youth" or ageing process is responsible for increasing the risk of individuals to many diseases including [[cancer]], [[Parkinson's]], [[Alzheimer's]], and others. As a result, in recent years, many high net worth individuals have donated large amounts of their money towards initiatives towards scientific research into the ageing process itself or therapies to slow or reverse the ageing process.<ref>{{cite news|last1=Wallace|first1=Benjamin|title=An MIT Scientist Claims That This Pill Is the Fountain of Youth|url=http://nymag.com/scienceofus/2016/08/is-elysium-healths-basis-the-fountain-of-youth.html|work=New York Magazine|date=August 23, 2016|language=en}}</ref> These people include [[Peter Thiel]],<ref>{{cite news|title=Billionaire Peter Thiel embarks on anti-aging crusade|url=https://venturebeat.com/2014/10/08/billionaire-peter-thiel-may-want-to-live-forever/}}</ref> [[Aubrey de Grey]],<ref>{{cite news|title=terview with Aubrey de Grey, PhD|url=http://www.lef.org/magazine/2013/7/Interview-with-Aubrey-de-Grey-PhD/Page-01}}</ref> [[Larry Ellison]], [[Sergey Brin]], [[Dmitry Itskov]], [[Paul Glenn]],<ref>{{cite web|title=These Tech Billionaires Are Determined to Buy Their Way Out of Death |url=http://www.businessinsider.com/tech-billionaires-immortality-2013-8?IR=T}}</ref> and [[Mark Zuckerberg]].<ref>{{cite news|url=http://phys.org/news/2013-02-zuckerberg-brin-life.html|title=Zuckerberg, Brin join forces to extend life|date=February 20, 2013|accessdate=August 8, 2016}}</ref> This would allow humans to extend or maintain their youth indefinitely.
+The "loss of youth" or ageing process is responsible for increasing the risk of individuals to many diseases including [[cancer]], [[Parkinson's]], [[Alzheimer's]], and others. As a result, in recent years, many high net worth individuals have donated large amounts of their money towards initiatives towards scientific research into the ageing process itself or therapies to slow or reverse the ageing process.<ref>{{cite news|last1=Wallace|first1=Benjamin|title=An MIT Scientist Claims That This Pill Is the Fountain of Youth|url=http://nymag.com/scienceofus/2016/08/is-elysium-healths-basis-the-fountain-of-youth.html|work=New York Magazine|date=August 23, 2016|language=en}}</ref> These people include [[Jeff Bezos]], [[Ray Kurzweil]], [[Peter Thiel]],<ref>{{cite news|title=Billionaire Peter Thiel embarks on anti-aging crusade|url=https://venturebeat.com/2014/10/08/billionaire-peter-thiel-may-want-to-live-forever/}}</ref> [[Aubrey de Grey]], [[Larry Ellison]], [[Sergey Brin]], [[Dmitry Itskov]], [[Paul Gallen]],<ref>{{cite web|title=These Tech Billionaires Are Determined to Buy Their Way Out of Death | website=[[Business Insider]] |url=http://www.businessinsider.com/tech-billionaires-immortality-2013-8?IR=T}}</ref> and [[Mark Zuckerberg]].<ref>{{cite news|url=http://phys.org/news/2013-02-zuckerberg-brin-life.html|title=Zuckerberg, Brin join forces to extend life|date=February 20, 2013|access-date=August 8, 2016}}</ref>
 ==See also==
-*[[Ageless]]
 *[[DNA damage theory of aging]]
-*[[Dorian Gray]]
 *[[Elixir of life]]
 *[[Fountain of Youth]]
 *[[Indefinite lifespan]]
 *[[Immortality]]
-*[[Peter Pan]]
 ==References==
@@ Line 43: / Line 39: @@
 {{Reflist|refs=
-<ref name="Siegel">{{cite web|author=Lee J. Siegel |title=ARE TELOMERES THE KEY TO AGING AND CANCER? |url=http://learn.genetics.utah.edu/content/begin/traits/telomeres/ |deadurl=yes |archiveurl=https://web.archive.org/web/20130120022356/http://learn.genetics.utah.edu/content/begin/traits/telomeres/ |archivedate=2013-01-20 |df= }}</ref>
+<ref name="Siegel">{{cite web|author=Lee J. Siegel |title=ARE TELOMERES THE KEY TO AGING AND CANCER? |url=http://learn.genetics.utah.edu/content/begin/traits/telomeres/ |url-status=dead |archive-url=https://web.archive.org/web/20130120022356/http://learn.genetics.utah.edu/content/begin/traits/telomeres/ |archive-date=2013-01-20 }}</ref>
-<ref name="Damm">{{cite journal |author=Klaus Damm |title=A highly selective telomerase inhibitor limiting human cancer cell proliferation |url=http://www.nature.com/emboj/journal/v20/n24/full/7594184a.html |journal=The EMBO Journal |year=2001 |doi=10.1093/emboj/20.24.6958 |volume=20 |issue=24 |pages=6958–6968 |pmid=11742973 |pmc=125790}}</ref>
+<ref name="Damm">{{cite journal |author=Klaus Damm |title=A highly selective telomerase inhibitor limiting human cancer cell proliferation |journal=The EMBO Journal |year=2001 |doi=10.1093/emboj/20.24.6958 |volume=20 |issue=24 |pages=6958–6968 |pmid=11742973 |pmc=125790}}</ref>
 <ref name="Hornsby">{{cite journal |author=Peter J. Hornsby |title=Telomerase and the aging process |year=2007 |journal= Experimental Gerontology|doi=10.1016/j.exger.2007.03.007 |pmc=1933587 |pmid=17482404 |volume=42 |issue=7 |pages=575–81}}</ref>
@@ Line 51: / Line 47: @@
 }}
+{{Clear}}
 {{Longevity}}
 {{DEFAULTSORT:Eternal Youth}}
 [[Category:Death]]
-[[Category:Fictional superhuman features or abilities]]
+[[Category:Fictional superhuman abilities]]
 [[Category:Life extension]]
 [[Category:Mythological powers]]
 [[Category:Youth]]
-[[Category:Ageing]]
+[[Category:Immortality]]