Making money is a hobby that will complement any other hobbies you have, beautifully.
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 was born in 1950 and watched science fiction and horror movies on TV and was always really fascinated by them.