Last few shows I've gone to have been 19+ and the ages went from around there to late 30s. But American shows could be a whole different story.
I imagine the bulk of their fanbase are holdovers from ICPs heyday but there's still a healthy enough younger fanbase to keep the longevity growing. They stated that last year's Gathering was the first year they were able to break even so that sounds like they're still gaining a new following from somewhere.
I'm not sure I can say I can
recommend them. At least not in the same way you can recommend any other band. ICP has a pretty unique sound where it's classified as hip-hop but nobody from hip-hop would ever say it is
I like them for their immense creativity; each album is like listening to an anthology of mini horror movies. They're chill stuff is pretty good too.
HORROR:
Bowling Balls,
Falling Apart,
Hate Her To Death
CHILL:
Homies,
Forever,
Juggalo Party