True staying power?

Thinking of how fandoms can fall out of fashion pretty much like clockwork and fail to capture the interests of new fans that didn't grow up with the original show/game/work.

Is there anything with some real staying power you've noticed? Like something your parents generation (or the older ones) likes that your peer group also likes enough to form a fandom around?

Food is cheating tho, but I'm allowing music as a category.