Shouldn’t this be in Great Debates?
Having owned both (Side note- I now own a Dreamcast- if you’re considering getting one, Caveat Emptor. Sega has horrid customer service even though the DC is leaps and bounds beyond the other two), I would definitely recommend the N64 for children in that age group. The Sony can have the CDs easily scratched, the CD lens can become easily damaged, and memory cards can be easily lost. The N64 has fewer games but many of them are appropriate for the younger set.
For the N64 for kids I’d recommend: Beetle Adventure Racing, any of the Mario games (Super Mario Bros, Mario Kart, Mario Party, Mario Golf, etc… Even Super Smash Bros., a fighting game, is very nonviolent. You win by knocking the other person off the platform), Diddy Kong Racing, Int’l Superstar Soccer, Zelda (an excellent game), 1080 Snowboarding, Banjo Kazooie, F-Zero, FIFA 99, San Fran Rush and the sequel, Space Station Sillicon Valley (which may be a bit too cerebral for the younger set- its puzzle oriented), Wave Race, and Wipeout 64. There are other good games that are not appropriate for young kids (Goldeneye, Turok, etc…)
As I said, I wouldn’t recommend the PSX for young kids but if you get one anyway and want a list of kid-friendly games, please e-mail me.