These three men walk in to this Beer Bar with topless girls serving beer in bottles, off the tap and cans.    None of them had an ID and ran in to trouble.    They wanted to prove they are old enough to drink beer.    

First man removes his hat and shows his semi bald head and says, "see I am old and bald".

Second man removes his T shirt shows all the white hair on his chest and says "do you see all this white hair, you get it when you are old"

Third man drops his pants and brief and shows his hanging penis and says "look girl, you are showing your big boobs and I can see your pussy thru that tiny thong and I still cannot get it to go hard.  It happens when you are old"