Playing Up' to play up an age or grade level from the age or grade level you belong in.
When the boys are playing with kids their own age, it is not playing up. I don't care that they are a school year behind because they are holdbacks or pre-first. Let's not pretend that they aren't older 2022s or the equivalent of on age 2021s because we all know better.
Lets not pretend that birthdates, holdbacks, and pre first kids are your problem. Your problem is that club lacrosse's best teams are full of kids that are pretty good and you feel badly for your son that he is "disadvantaged" bc of age and not bc of the simple fact that life isn't fair. Grow up and do something productive for yourself. If you can't ask for help. There are plenty of people who will help you in the lacrosse world.
