A thought: scientists are trying to extend life (e.g., telomerase research) and create better quality of life (e.g., cancer research). They are trying to push the lifespan of humans to more than a hundred years.

Personally, eternal life (a very distant but not ridiculous possibility) and very long life (a not so distant possibility) seem to me to be slightly undesirable even. I mean, can you imagine living forever? Pain multiplied by infinity? And even if we find a way to live with our demons, where, exactly, are humans going to live if nobody is actively trying to maintain a reasonable environment? H.G. Wells might have gotten it right with the Morlocks...