The injury thing seems like a stretch in that you are relating it to size and there are many kids the same age that are vastly different in size. I do think that lax teams and tournaments should be age based but purely based on fairness. It is clearly an advantage to hold your kid back from an athletic perspective so essentially you are putting those who do not at a disadvantage .That disadvantage can ultimately impact where your child goes to school etc. Some of you will disagree but not much different from taking steroids out of sports as best as possible. | 
