As of 2009, natural selection has developed biological immortality in at least one species, the jellyfish Turritopsis nutricula, Certain scientists, futurists, and philosophers, such as Ray Kurzweil, advocate that human immortality is achievable in the first few decades of the 21st century, while other advocates believe that life extension is a more achievable goal in the short term, with immortality awaiting further research breakthroughs further into an indefinite future.Aubrey de Grey, a researcher who has developed a series of biomedical rejuvenation strategies to reverse human aging (called SENS), believes that his proposed plan for ending aging may be implementable in two or three decades.
It is not known whether human physical immortality is an unachievable phenomenon or not.
Wittgenstein, in a notably non-theological interpretation of eternal life, writes in the Tractatus that, "If we take eternity to mean not infinite temporal duration but timelessness, then eternal life belongs to those who live in the present." Physical immortality is a state of life that allows a person to avoid death and maintain conscious thought.
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Immortality (or eternal life) is the concept of living in physical or spiritual form for an infinite length of time As immortality is the negation of mortality—not dying or not being subject to death—it has been a subject of the greatest fascination to mankind since at least the beginning of history.
The Epic of Gilgamesh, one of the first literary works, dating back at least to the 22nd century BC, is primarily a quest of a hero seeking to become immortal.