I'm in a similar boat as you! I started cycling last year at 37 and while I was already quite fit and adapted well...I'm still working on my cycling skills (and I've got a long way to go!). It is odd to think that I am just starting out at this while a couple of guys I work with are 'retired' from racing and they are only a couple of years older than me. Of course, they've been competitive since they were in their early teens and now they want to raise their families...so the situation is very different.

I agree with what everyone said about giving yourself some time to get used to being on the bike. I completed two centuries this year and regularly commute to work, but I know that I still need a lot of experience before I'm ready to race. I've always looked young for my age...so maybe it'll come in handy! Oh, and my guess is that the 25 year olds are faster because they've been riding longer...not because their bodies are younger.

Keep it up and you'll get there...and likely it'll be long before you get decrepit!