I agree, every day is one day closer to death. I guess having been near death so many times, it is not something scary for me. I fact, at times I welcome the release of it, but it never comes. That's not to say I'm not happy to be alive. Once you have accepted it as inevitable and live with that in the back of your mind, I find you let it go. It doesn't hold any power over you other than that you have either decided to live the best you can or not. I have no stress about it because I have discussed and thought about it enough and come to terms with it since I was a young teen.

To sort of answer your question, I want to live as long as my mind is happy to be present in my body. Sounds weird to say, but I think that covers what I mean. If I were in a pain riddled body to the point I wanted out at all costs, or if I were mentally anguished with no relief in sight, then I would welcome death. However, as I have clearly not killed myself yet despite plenty of health problems, even a smidgen of hope for positive change can keep me going. I have intellectual curiosity and still take pleasure in many things and those are my two requisites for wanting to stay alive.

To put numbers on it is so difficult for me, but I will say I have seen people in their 90's who are still sharp as a tack and not suffering horribly. I think I will live into my 80's but would be happy living longer, though I don't care if I croak in my 80's.