"Are you over 21?"
"Over 21? I'm a Balrog, for Melkor's sake! I was created at the beginning of time with the Valar, and was given power over fire and darkness by Morgoth Bauglir during the First Age! I think that makes me a bit over 21!"
"Do you have ID?"
"ID? Come on Gandalf, you know me."
"Sorry, but without ID you shall not pass."