At our local track, my little brother races the 7-11 65 class on his kx 60. He is the only one on a 60, but back to the point, the top 3 guys are 13 years old. All three of them. Their parents are taching them the morals to lie so they can have a walk in the park for sponsorship. By meeting these kids you would know that their parents do this. You don't want to end up teaching your kid bad morals... so if the age limit is 11, just get an 85, and shave the seat and soften the suspension. I did that and i was 11 years old, and it worked great.