12 Year Old Scotch

A guy comes into a bar and asks the barman for twelve-year-old scotch. The barman thinks "This guy is pretty pretentious." and proceeds to pour him a drink of six-year-old scotch. 
He gives it to the customer who takes a drink, exclaiming, "This isn't twelve-year-old scotch, this is six-year-old scotch!" 
The barman thinks, "Hey, this guy knows what he's talking about," and the two of them get into a conversation about where the customer is from etc...
At one point an old guy, who was sitting at the other end of the bar comes over with a glass and hands it to the customer. The latter takes a drink, and spits it out. 
"This is piss!" he yells. 
The old guy nods and says, "Yeah, but how old am I?" 
Category:A man walks into a bar....
Category:Aging Humor