I'm 73 and I think about this all the time. I feel like I accept the aging process, but then I avoid looking at too much of myself in the mirror, because seriously, I look like shit. I'm still having fun but I have slowed down a lot. So for the duration of whatever years remain, I'll enjoy it as much as I can, but that doesn't include trying to improve my appearance. If I lived at the gym I my be able to do that, but who the fuck wants to spend all that time there? There is too much fun to be had.
When it stops being fun, may God be merciful and get me the fuck out of here.