Lacrosse is living in the stone ages when it comes to this. How in this day and age do not they not play in age brackets vs "school years" is beyond me. In addition @ any given tourney outside of a once in a while USLacrosse registration (still dont require birth certificates to register) requirement, you can have upper class kids fill roster spots for teams. To sum it up, you can have a kid get "left back" 2x's and be 2 years older than the kids in his age group and be legitamely eligible.