It is particularly useful for Coaches as well. As long as we all agree there can be no complaints afterwards.
Never start the conversation with 'are you familiar with the variations at our age group' -- even if they aren't sure, it's very hard for a ref to admit, 'no'. And some will be sure (but wrong!)
when i was managing a youth team (and starting my reffing journey), my routine with arriving society refs was always to meet them early, make them welcome, and then say 'can I run through a couple of league regulations with you?'
(this is much better than offering to run through the
Laws, no one wants to be thought ignorant of the laws, but no one minds not knowing the regs).
Then I would run through the important law variations - starting with the ones that refs often got wrong.
This would normally be a very quick and useful conversation!