I have never been to Vegas, but as my friend told me...
He was in a bar with his wife, somehow they got chatting to an old couple (in their 70s) from London. The old guy went to order drinks, and at 70+ years old, he was STILL asked for ID. The policy was, apparently, to ID 100%, and that way... they couldn't go wrong.
Drinking ages, I know nothing about. But ID is a must.
