Ignoring any claims that the man is a crackpot and any other problems one might have with the science. Does anyone really want to live to 1000? I think you might get a little bored :-/
Which, at least for me, is less about avoiding death (which doesn't actually scare me all that much) and more about just getting to see what sort of cool stuff the future holds.
Boredom is infinitely better than nothingness.