I think that age as a number is not nearly as important as health. You can be in poor health and be pretty miserable at 40 or 50. If you're in good health, you can enjoy things into your 80s.
I got to experience soccer at the highest level at a young age; I decided I wanted to be part of that for as long as possible.
We're all interested in life outside of Earth. We all have a fascination with what's out there because we don't really know.