I'm 39 and plannning on competing starting next year. However, because crit racing is so uber-competitive here I am focusing my training on triathlon. In tri, I can enter in age-group categories.
I have a cycling buddy who didn't start training until he was 40. Now in his mid-fifties, he recently completed a major tri in under 2:30, averaging nearly 22mph in the bike leg. As a comparison, my early-40s BF (a former collegiate track/cycling star who has been doing this most of his life) finished the same race in 2:40, averaging 19mph on the bike.
It's never too late to start!



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Oh, and my guess is that the 25 year olds are faster because they've been riding longer...not because their bodies are younger.

and I jsut started riding in July. I too average about 100+ miles a week (when I manage to stay "upright" that is).
!) As part of the "50 and Older" contingent on TE, I feel like a wise old mentor
. Don't hold yourself back. Don't be timid. Go out and try. Show those 20 yr olds HE** when you race with them! It is most definitely do-able. Just don't wait too long. And have fun!! 
