I 'm guessing, but the average age of racers in the Various Nostalgia Super Stock Series is mid 60's. We've got guys starting after they've retired. I'll be 60 next month, car runs mid 9's, pass the physical, a few aches & pains, Life is good. My wife and I were talking about where we'll retire to, and we agreed to stay in the mid-west, that's where there's the most NSS races. I won't retire for 6 more years, but looking ahead. Takes longer to do things, but so what. As long as your reactions are good , and your not a danger to anyone, have at it.