I have been in RC since i was 10, i started racing at 12, and i'm still racing after a 10 month break i'm getting right back in for the end of carpet season
oh well, i think that there shouldn't be an age limit but there should be limits, you can't have 5 year old kids who still yell and hit to get their way, it just doesn't make it fun for ht rest of the racers.
PS watch out for the old guys, they know that you're coming for their spot in the rankings.
just be nice, don't let anything or anyone get under your skin, if there are old cranky guys just stay away from them and have a good time. It really helps