MY son now 14 and a maybe just a little big for his age now,but went through a very large growth spurt at age 11 and looked 13, I actually had a parent run after us after a game accusing us of playing our son down, some kids are bigger than others and people should not assume a kid is older just because he looks older.
I think most of these parents that have a problem with this have small boys, no matter what the new August 31st rule is there will always be players almost a year older as there are 12 months in a year.its very petty really, | 
