I say go for it if you want to; and, any doubts you have about fitness and such are normal. I suspect that many here have competed at top levels, then, had kids, pursued careers, or got into other things that took time away from our athletic/relaxation/(fill in the blank) pursuits...enjoy your life. I'm loving racing again and I have been fodder thus far, but, I know I am going to kick butt again eventually; and, if I don't, so what. I'm still riding and loving it...don't go for past glory...look ahead and make what you want of your future.