No, I don't race. Just trail ride and hillclimb. I'm in San Lorenzo, near Oakland. My friends and I are all over 40 (Gasp!) and got back into riding after about a 20 year layoff. We ride Carnegie, Hollister, and a little track at Metcalf in San Jose.
I'm in about the same boat. 43 w/20 yr lay off. I ride a 2003 RM 250.
I will ride a lot of the same places. I live in Valley Springs-East of Stockton in foot hills. I'm trying to get everything ready to try Vet. MX.
Maybe we will run into each other some day.