My son is also 10 and just got down to 149 lbs. and is usually listed in the heavyweight division. I was glad there was a separation at 150 in Topeka. He has been wrestling much heavier kids. I enjoy watching him in the light heavyweight, it seems to even out the match. When he is in heavy weight matches, a lot of the time one kid will get the other down and then just lays on them to get the pin. When he wrestles kids more close to his weight you can see more moves.
