Lacrosse seems to allow June/July/Aug to flip up or down depending on grade - so yes - the youngest kid (born in June, playing down) can be 15 months younger than the oldest. Cut off date is 9/1. (
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They also have the standard 12 month band. No idea how many clubs/leagues have moved from one to the other and/or what they've found by doing so. Would also be good to have some $ info on how much the average player is paying their club, to see how much overhead that particular sport has become accustomed to in managing the overhead. My guess is the average lacrosse player in the US is spending significantly more on it than the average soccer player in the US, but it's only a guess.
You've got it backwards. They already have to provide birth certificate. It's the schooling docs to be added. Not only the collection of them, but the verification of all of the different options to check validity against whatever standards are laid out.
Your suggestion doesn't do #1 or #3. You can say that it does, but you can also say that any of this is likely to be implemented. None of it is more than a hopeful guess - and #3 specifically is quite hard to believe.
It does the 2nd and 4th, by making the soccer year 15 months instead of 12. An even easier suggestion that would also do #2 and #4 is to just stop collecting age data docs and trust that everyone will just play on the team they think is fair for their kid. There would be zero trapped players, every player could play with their grade, and nobody would be subject to any pesky date restrictions. (And they could drive themselves to practice from U12 on.)