I had my wisdom teeth out when I was 12 (before they grew in) because I had braces and they didn't want to have everything get messed up if my wisdom teeth started coming in in the middle of it. They only took out the bottom ones though, but the top ones are in and everything is fine and dandy so I'm not going to fix what isn't broken lol.
The second time I had surgery was when I was 19. I have (or I guess had because it's fully controlled now) a hormone disorder and basically my estrogen levels were so high that I developed pretty bad gynecomastia (basically the fancy medical term for 'manboobs' lol). For a variety of reasons it went untreated for about a decade until eventually I ended up getting it surgically fixed. The funny thing is that it (the surgery) happened three days before Christmas so it was like the worst Christmas present ever but also kinda the best in a way because after the initial recovery period was over I felt so much better and less awkward in my own body, so yay. It's been about four years and the scars are almost gone, so that's cool too.
Third surgery was when I was 20 (the summer of the same year I had the previous surgery) and I was having abdominal surgery (related to the same hormone disorder). That was the most interesting I guess because I had to spend one night in the hospital (just to make sure everything was okay). It was actually really, really, really boring, but I supposed if you are in the hospital, "boring" is probably not the worst thing that it could be. I remember I had to relearn to walk a little bit because the medicine and stuff they gave me took a little bit to wear off, but before the week was up it was like it never happened. The scars were basically gone by then too because the surgery was done the minimally invasive way.
Those were the three times I had surgery, and I don't plan on increasing that number any time soon. I am pretty scared of surgery (and I remember all three times freaking out right before because I was convinced I was going to die. Obviously I didn't).