How old did they look? If they were at least in their late thirties or early forties, they haven't gotten out much.
But then again I'm nearing seventy, and I'd probably wouldn't recognize many famous, young entertainers today. Never listen to any of them.
However, when I was in my teens many of the people/entertainers I liked (such as Jack Benny, Bob Hope, Red Skelton, etal) were as much as fifty years or more older than I was. We didn't care what age they were.
The vet wasn't a spring chicken but wasn't as old as I am (this year I reached that 7th decade that you're nearing). The tech was quite young. She did know
of Glen Campbell but only because of her parents. Both drew a blank when I sang a few notes of "Galveston." (Yes, I sang in the exam room. I'm eccentric that way.)
Like you, I don't have much knowledge of today's singers, except for the few whose work is present in many media venues. Before the groping trial, I knew who Taylor Swift was. The only song I know of hers is from that viral video of the policeman lip syncing it in his car, which I thought was just a hoot. Reminded me of myself and some of my own "performances" behind the wheel. Also, like you, I was well acquainted with the names of the entertainers you mentioned.
Policeman performing Taylor Swift song:
https://www.youtube.com/watch?v=8XFBUM8dMqw