Reader Jake T. sent me a link to '11 Sounds That Your Kids Have Probably Never Heard' over at Mental Floss. I'll be darned if I couldn't remember every one of them! For example, I used rotary-dial telephones well into the 1970's, making this sound very familiar to my ears:
There are more sounds at the link. It makes me feel very much 'over the hill' to realize that younger people (including my lovely wife) have never heard many of them, and may recall others only very dimly from their infancy and young childhood, as they were replaced by more modern technology.
Gee, thanks, Jake. I feel old now!