might have to do with the legal age differences
when you’re 18 over here youre allowed everything..the only upper step on the ladder is 21 but this is only applying to crime charges as it’s the final limit to which youth crime charges can be applied i think.
other than in the us at least you can drink with 16 and drive cars ( buy porn, drink heavy liquor…) only from 18 on.
so there are no “society don’t”s from 18 on, 21 nearly plays no role at all.
i think most clubs handle it that way too.
but then its even a crime to stomp a consenting adult an axe into his/her shoulder…same trickyness as i mentioned before… its more a case-to-case thing.