umm when i was on carnival we never did anything with the teen stuff and it was before club 02. but i was 14 and hung out with a bunch of people not my age. our group ranged from 13-17. and i still went to the disco and stuff for the 15-17 year olds and they never checked. so yea i dont think theyre very strict.
every ship i've been on, my group has always had a wide range of ages.. 11-14. 12-17. 13-17. and the last one was 14-17. which pissed off the rccl teen club people cuz apparently they didnt want us to be friends with the 14 year olds.