Potentially possible - but don't think I'd want to live that long if more than half of it was suffering with old age related difficulties :|
Mmm
On the other hand, your senses, thinking processes and memories vanish when your brain packs in so dying from a personal perspective doesn't improve matters.
I'll take the extended life with diminished facilities for as long as possible.
I mean if I subscribe to a conciousness after death scheme that's never been proven and it doesn't work I'm not going to feel like a right lemon. It would serve me right, if I was around to think about it.
So I'd rather not wish the finger to get to the light switch any faster.