I’m currently going through the junior year of my high school, that was 20 years ago exactly. It has been 22 years since my favorite baseball team, the Boston Red Sox, had finally broken their Curse of the Bambino in 2004. The Harry Potter main book series ended 19 years ago while the film series ended 15 years ago.
Just now when I tried to think of an example and realized I’ve been having these kinds of thoughts for 30 years. I remember in the 90s when I realized it was as long ago that Grease came out as it was from then to when it took place.