While the dream of immortality might be as old as mankind, the jellyfish Turritopsis nutricula (image) seems to be living it:

The hydrozoan Turritopsis nutricula has evolved a remarkable variation on this theme, and in so doing appears to have achieved immortality. The solitary medusa of this species can revert to its polyp stage after becoming sexually mature (Bavestrello et al., 1992; Piraino et al., 1996). In the laboratory, 100% of these medusae regularly undergo this change. Thus, it is possible that organismic death does not occur in this species!

An in-depth research paper.
posted by Foci for Analysis on Jan 30, 2008 - 48 comments

Do You Want To Live Forever? [Google Video - Channel4 documentary] Aubrey de Grey is a genius, a weirdo and predicts the death of death. Don't miss his lectures and some interviews as well. Who is going to be the first immortal MeFite?
posted by homodigitalis on Aug 19, 2007 - 78 comments

Autopsy: Life & Death. Following on from Anatomy for Beginners which concentrated on the anatomy of life, anatomist Dr Gunther von Hagens and pathologist Professor John Lee now turn to the process of understanding death. Full video clips.
posted by srboisvert on Jan 21, 2006 - 11 comments

Death as we know it will die. If you wish to be a prophet, first you must dress the part. No more silk ties or tasseled loafers. Instead, throw on a wrinkled T-shirt, frayed jeans, and dirty sneakers. You should appear somewhat unkempt, as if combs and showers were only for the unenlightened. When you encounter critics, as all prophets do, dismiss them as idiots. Make sure to pepper your conversation with grandiose predictions and remind others of your genius often, lest they forget. Oh, and if possible, grow a very long beard. By these measures, Aubrey de Grey is indeed a prophet. The 42-year-old English biogerontologist has made his name by claiming that some people alive right now could live for 1,000 years or longer. Maybe much longer. Growing old is not, in his view, an inevitable consequence of the human condition; rather, it is the result of accumulated damage at the cellular and molecular levels that medical advances will soon be able to prevent — or even reverse — allowing people to go on living pretty much indefinitely.
posted by sharksandwich on Oct 30, 2005 - 43 comments

Scientists discover secrets behind aging process raising the possibility that hormonal therapy could add decades to the human life span. While I'm generally environmentally aware and concerned about overpopulation, all I can think is - sign me up!
posted by quirked on Apr 6, 2001 - 19 comments