we went to lunch at a chain place today called "The Green Turtle".
I'm familiar with the chain. The Green Turtle was once a decent dive bar (oxymoron?) in Ocean City, MD. Years ago they began franchising, and frankly, the franchises suck. The Turtle is also known as a hangout for younger drinkers.
Typically, when servers are carding 66 year old patrons, it's because the facility has had a recent violation for serving underage drinkers. The move by management is "card 'em all," to eliminate any chance of losing their license. This usually eases in time.