Maybe it used to be fairly common....”
I went to a small country grade school, all 8 grades in one room so the younger kids got to hear the older kids lessons. Ended up skipping two grades and so was only 16 when I graduated versus my friends who were all 18. Embarrassing on occasion when I couldn’t legally do things they could but great now because I’m the youngest at all of my class reunions!
“I’m the youngest at all of my class reunions!”
I graduated a year early, and I too am the youngest at all of my class reunions...60th coming up next year. I rather like it this way! Notice that I did it without all the Rapidly Changing Technology, and my ‘home schooling’ was self imposed (via my attention to homework, and extra attention to detail, plus my extraordinary level of intelligence) :) LOL while I pat myself on the back...