heres the thing.. when young people say "Oh god I never wanna get old, I'll shoot myself before that happens!", it never really happens (99% of the time atleast :P)... once ya get to that point at which you realize your old, you basically have the same mentality that you had when you were young, which is you want to live. and you'll find new ways to fill your time, just as you do now. and then you'll die.
what we think we want now, will almost definately change later.