Kinda confused too. I guess if you mean USA wrestling KS where it's a Sept Bday or if you mean USA wrestling at the national level, where it is by birth years as of Jan 1. If you mean AAU moved to the USA wrestling standard at the national level then i feel your pain, as my boy misses an age group by 2 days. I've always told him it doesn't matter when you get to HS. Wrestle on, and don't worry about age groups. Dang mom, could have waited 2 days! Lol.