I'm a foolish optimist with a big mouth, that's for sure. Forgive my immature brashness.
I understand Stephen and you're right, our bodies will inevitably succumb to unexpected events and trauma (accidents, cancer, disease, genetics, etc), but our mind, attitude, outlook, and willpower does not have to. It seems that it is instilled in our culture here in America to fear being of middle age or a senior. Why? That's a sad outlook on life. To always be looking at the past thinking "Man, if I were only 20 again!" doesn't do you any good at 30, 40, 50, etc. I'm not saying it's easy, but we do have some choice. I have seen my father who is now 52 cultivate a life of activity and seen this payoff for him. Maybe my inspiration is atypical here in America, but it is a possibility and not out of the realm of reality.