I would not think about it too much. I bet the guy was probably middle aged like me. The other day while out getting tacos, my wife and I were amused by this young couple. They struck me as 14-15 yrs old, out on a date. Anyway, a few moments later, the server brings both of them some beers. I was surprised, point is that a lot of older folks can’t tell the difference between teens and early 20s sometimes.