Hard for me to get my head around this question. My parents always said if they lived to 80 it would be great (they both did, my dad 80+10days, mom 84). I'll be 67 in a couple of weeks - I can't imagine that I will decline that much in 13 years. How long do I want to live? I'd love to see where the world is in 10 or 20, years but I would also be OK if I went in my sleep tonight. What I don't want is to live beyond my expiration date!