I met an 8 year old boy in a local shop a few years ago, who stumbled across the old video game collectard channels on you tube, and was a collector/player, he'd be there almost every weekend with his parents looking at new games. He even opened up a new (old game) which I thought was going to kill the larger pale kid working behind the counter. He was in love with sonic and the genesis mostly.
But other than that I've yet to come across a younger child who likes the old games as much as I do in person. But it is fun to introduce them to the games, and sometimes you get lucky with a game or two. My friends two girls 8 and 9 took a liking to mario kart on the N64 if 4 people are playing.