There was an interesting TED talk by Aubrey de Grey about aging (he's against it and thinks it's unnecessary).

Definitely food for thought. When I first came across it, my reaction was "what a horrible idea – aging and death are part of the natural cycle." However, if one defines "aging" as "cumulative damage", as he does, it raises the question: what benefit is gained from permitting damage to accumulate if it's possible to avoid it? What if we could prevent the negative symptoms of aging so that people are vigorous and healthy all their lives?