C'mon -- this is all supposed to be about having fun, right? I don't know if I would hire a private investigator to dig up the dirt on this child, however I think I would speak to the person / people who oversee the league. I'll warn you, though, somebody may pull out the "It's supposed to be fun" card on you. I haven't had an age-related issue like you are mentioning, but I have had coaches pull that card on me. Of course, they did it when they were winning (I coach both soccer and baseball/softball). Here are the reasons I would raise: 1. It is not benefitting the kid who is "playing down." This year, my wife and I moved my second-grade daughter up to play fastpitch softball with the third and fourth graders. The two reasons we did that were because we felt she could compete, and also because it is easier for a softball coach to coach two of his daughters on one team. My point is that the experience my daughter gained, in success and in failure, will benefit her greatly. It helped that she was one of the better players on the team, too http://static.yuku.com/v2//domainskins/bypass/img/smileys/wink.gif. 2. It is not benefitting the kids he is playing with. When kids play soccer at this age, many times they play scrum soccer. One thing I have tried to teach my team as they have progressed (we are entering U9 now) is how to share the ball. This is difficult to teach to five year olds just because they are, well, five-year-olds. Having the big kid run around everybody else leaving his teammates behind (not giving them a chance) probably becomes more of a deterrant than anything else. If there is a clear violation of the age limit, then it would just be best for all parties to have the boy placed in the right age group. I hope it all works out for you...