There should not be more than 11 month difference between the oldest and youngest kid by grad year. unless your kid was left back. If he was, then he should probably bring focusing on school and not lacrosse. even kids the same age can have a 30lb -40lb difference between them. So if it's the size of the boys you have an issue with. Then seperate them by weight classes and not age. If your a parent that is playing your 7th grader at the 6th grade level. Then shame on you for separating your kid from kids in his grade and kids going through the same experiences.