There is not some nefarious conspiracy at the youth level to hold kids back at school, so that during club lacrosse they can be gaming the system by a year (playing down). Parents have their kids in school, and do what is best for them. Then when it is time to sign up for sports, you either check your age, or you check your grade, depending on what system that sport is using. Sometimes you will be older, sometimes you will be younger. The kids that love the game don't care about this, unless their parents whine at home about it, then it gets planted in their brains at some point. There will always be some bad seed that does the wrong thing for their kid, but lacrosse has mostly good people. It's a shame to create the sense that there is some universal widespread problem.