I don't know, my ears are still very much wet :P
When there is nobody older than you in the group/room.
I thought I would feel really grown up by 21 ..... But here I am nearly 70 and still very much a work in progress. :)
26, still wet
CHEESE
โIf you sit in on a poker game and donโt see a sucker, get up. Youโre the sucker.โ So your not any longer wet behind your ears when you know that you are not the sucker in any given situation. Because then that guy is wet behind his ears in my opinion.