By Lori Stuart Kucenas - Posted on Jul 18, 2011 1 23 At 11 he is also starting the puberty stage and the surges in testerone. Most boys do become more aggressive during this time. I would make sure he has plenty of outlets for his energy. Track, karate, basketball... Talk to him about how he expresses his anger and give him suggestions / alternatives to dealing with it. A punching bag, hand squeezer... Also, during this time a counselor can really help. 5 By Amy - commented on Aug 10, 2011 4 0 Thank you !