Don't you love it. We're mid fifties and this still happens. Usually some youngster just following bosses' 'card everyone' directive. You just smile at them and ask if they're serious.
I got IDed at one of Gary Thompson's convenience stores yesterday morning buying a couple of packs of cigarettes. I am only 64! They ID everyone and record the DOB with each sale. It is amazing what our society has everyone endure just to protect the feelings of the precious few.
Went out to a Mexican resturant we go to frequently Friday after work with our staff and we ordered pitchers of margaritas and she asked to see ids from everyone at our table. I asked if she wanted to see mine as well. She handled it very well - she smiled and said that's not necessary I've seen yours before which she hasn't but I'm obviously over 21.