I know you are kidding about on age parents suing leagues/clubs but would there be some validity? Think about it, a club/league knowingly put an older (potentially older, more mature physically) player in a contact sport that could injure a younger player by virtue of his physical maturity. Wrestlers go by weight and so does many youth football teams. This is done to protect the child. Lacrosse is a contact sport and they are blatantly scoffing at this clear and present danger.