Immortality

==Definitions==
{{Unreferenced section|date=November 2022}}

===Scientific===
{{main|Anti-aging movement}}
[[Life extension]] technologies claim to be developing a path to complete [[rejuvenation (aging)|rejuvenation]]. [[Cryonics]] holds out the hope that the dead can be revived in the future, following sufficient medical advancements. While, as shown with creatures such as [[Hydra (genus)|hydra]] and [[Planarian]] worms, it is indeed possible for a creature to be [[Biological immortality|biologically immortal]], these are animals which are physiologically very different from humans, and it is not known if something comparable will ever be possible for humans.{{sfn|Alexander|2003|pp=5-10}}{{sfn|Bolonkin|2010|pp=2-7}}

===Religious===
{{See also|Soul|Resurrection}}
Immortality in religion refers usually to either the belief in physical immortality or a more spiritual ''[[afterlife]]''. In traditions such as ancient Egyptian beliefs, Mesopotamian beliefs and ancient Greek beliefs, the immortal gods consequently were considered to have physical bodies. In Mesopotamian and Greek religion, the gods also made certain men and women physically immortal,{{sfn|Rohde|1925}}{{sfn|Endsjø|2023|pp=28-30, 33-39}} whereas in Christianity, many believe that all true believers will be [[resurrection|resurrected]] to physical immortality.{{sfn|Perkins|1984|pp=17–18}}{{sfn|af Hällström|1988|pp=9–10}} Similar beliefs that physical immortality is possible are held by [[Rastafari movement|Rastafarians]] or [[Rebirthing-Breathwork|Rebirthers]].