This is only slightly related, but I was at a fair the other day and there was a girl who couldn't have been more than 10 wearing a Sonny and Cher shirt.
I'm 47 and Sonny and Cher were divorced two years before I was born!
I mean some kids like older groups and musicians, my little brother is one of the biggest David Bowie fans I know and he was born after the turn of the millenia.