In our leagues here (Omaha/Council Bluffs metro area), we don't have cards or anything. Our directive has been we don't question the players' eligibility, that onus is on the managers.

I know I've had a couple young ladies who looked a very young 16, but were "eligible" according to their managers. Come to find out, they were actually rostered and a couple of teams had their protests denied because they thought those ladies were ineligible.