From my experience, it's possible to hate the high school/college years, but for them to also be comparably less terrible than what comes after, and so to look back at them with a strange kind of longing.

Like someone else in the thread said, they might have been miserable, but they had potential, options, future ambiguity. After a certain point, those narrow and solidify. A miserable past where the future wasn't set feels more glamorous than a miserable present railroaded into a miserable future.

I have mixed feelings about my teenage years. I wouldn't want to go back, but I can't say that adult life has turned out to be much better, or that I don't miss that time

I'm the opposite. I LOVED high school, and miss those friends dearly. I'm 45, and it has been difficult to find people that I gel with the same way, aside from my wife (who I started dating in high school). I miss being on the basketball team and marching band. I miss many of the teachers. I miss the 90s and no cell phones, and trolling AOL message boards. I miss being able to exist without the fear of having your life recorded, either by phones or government mass surveillance. I miss when it was accepted that Nazis were the bad guys, and Canada wasn't on fire and making the air quality in Chicago horrific every summer.

College was a great experience too, and I made some great friends, but I really focused on graduating in engineering so I slowly became the party-pooper, and in grad school my wife and I moved in together, got married, so it was a completely different life experience. Now my focus is on work and getting my 3 kids into good colleges.

I sometimes dream about being in high school again, or taking my kids back with me to see what life was like pre-cell phones. I wouldn't say that high school was the best part of my life, but it is a chapter I reminisce about and wish I could revisit occasionally.

"I never had any friends later on like the ones I had when I was twelve. Jesus, does anybody?" - Stephen King, Stand By Me