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.
When you're up against an electric band like that, it's like you're on two separate planets.
Even if you have a bad game, you have to swallow your pride and sign. It takes a little time, but it makes the kids happy. And it makes you feel good, too.