I'm
disappointed that I didn't watch it sooner

Me too!
Not to derail this thread, but this got me thinking about the history of teen movies.
In the golden age of cinema, they largely didn't exist (at least not as a genre we think of today). Sure, there were movies with teenagers in them, but very few focused on teens or were aimed toward teens, with the exception of the Mickey Rooney / Judy Garland musical jaunts.
In the 50's, teen movies seemed more like public service warnings about juvenile delinquency (the big issue during a relatively calm social period between wars) or the dangers of premarital sex (without ever really saying the words) and sometimes about the burgeoning danger of illegal drug use among youth. Most teen movies of the 50's were not comedies, but were filled with angst, focused on forbidden love and often had an ominous tone. (
Black Board Jungle, Rebel Without A Cause, A Summer Place).
There were still ominous warning movies about teens in the 60's, but things began to change with the advent of teen comedies & musicals as the rock & roll of the 50's began to seem more benign to the older generation and the years of psychedelic funk & the sexual revolution hadn't really fully set in yet. Beach movies like the
Gidget series, and Frankie & Annette films became all the rage.
The 70's probably ushered in what we think of as modern teen movies, although
American Graffiti,
Grease and
Cooley High were really period pieces about being a teen in what was even then a bygone age.
The 80's was the heyday for the modern teen comedy (with too many classics to list) that really formulated what has been a lasting genre for a few decades.
And that's my brief synopsis on the history of teen movies.