I generally only use custom stations on Pandora, so it ends up being the stations less prone to aging that I listen to more. 2000s rap, 2000s alternarock/emo especially because of the nostalgia factor, and really poppy EDM like Zedd and Calvin Harris that mostly becomes pleasant background noise when I'm driving.
I used to listen to a trap rap station and pop r&b station, but because of the likes it doesn't seem to update much and those kind of stations don't age well. I don't need to be hearing Trap Queen and Loyal anymore in 2018; maybe it'll be different in 2028