The movie star was at the weekend country festival supporting his wife, Rita Wilson, who was among the performers, when he decided he wanted "a nice tasty bucket of suds" - so he hit one of the on-site bars.
"There were four ladies... and I said, 'Pull me a draw'," the Oscar winner told talk show host Ellen DeGeneres, "and they said, 'We can't, because your ID has not been verified...' I said, 'What, you think I'm underage...? I'm 62 years old and you know my name, so I think I should be able to get a beer'."
But the women stood firm and told Tom he had to get the correct wristband.
"It was ridiculous, but I must give credit to these ladies - they did not cave. I was offering them tickets to stuff. I said, 'You will come to the 'Toy Story' premiere with me...!' They would not allow it... I argued with them for 20 minutes."
The ladies eventually walkie-talkied a colleague and he showed up with a "roll of red tape".
"He gave me a bracelet and then I chugged me a brewski," Hanks laughed.