Health organizations show that anyone born in 1980 or later was likely (99% of population) exposed to chicken pox as a child. While we can still get shingles, it’s survivable.
Chicken pox, like COVID, is very mild for children, making it an ideal vaccination target for youth.
I had chickenpox as a kid back in the sixties. While it was miserable, I didn’t get nearly as sick as I did from the German Measles. I have a heart murmur to this day from the measles.
So the chickenpox vaccine came out around 1980?