Heck, I'm 32 and I go to the track every once in awhile. I ride a cruiser (the old 20" just feels too small these days).
It's a blast, however, the jumps are way bigger and steeper than they used to be. Also, what's the deal with everyone using clipless? By the time you've clipped in the race is over!
I still have fun, we've got on of the best tracks in the state, good volunteer group and very well maintained and the races ususally run smoothly. Only problem is some of the parents are too involved and take it too seriously! Relax parents, remember the kids are supposed to be having fun!
L8R
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger