My younger brother and a son of one of my friends got into the retro-computers, specially into the Amiga and ST bec we showed these systems to them.
Actually they found them more interesting than PC's, they know they're limited, but you know, they have some essence PC's don't. I've even seen kids playing with C64's bec their fathers have one at home, and they like it. "It's not a PS3, but games are fun" under their own exact words.