Mid 30s here!
That means I'm old enough to have had phase I orthodontic treatment in the 80s, when I was a kid. I think starting treatment in elementary school was a pretty new thing at the time? I sure thought it was exciting though. I had a babysitter who had metal braces and elastics and a bite plate and I was hoping to get something really elaborate (haha! I had no idea) like her, but since I didn't even have all my teeth yet it didn't really work that way. I guess the treatment was super successful though because I wore braces for about a year and a half, got them off before I was ten, and have had straight teeth and a perfect bite ever since. Never needed to do that phase II.
The fascination, however, stuck with me!