Sometimes that's a movie. Sometimes a TV show. And sometimes it's a song.
Today's the 16th! So this is the song I thought of:
And since I'm a woman of a certain age, it also reminded me of a TV show from 1977-78 called James at 16 which began life as James at 15 and was cancelled before James at 17. This show was like an after school special and the normal types of things that happened were a precursor to the shows that are popular today, IMHO.