Personally, I loved Viva Pinata and it's proper sequel (that party game thing doesn't count) and I'm 18. And while I'm at Rare, I'm going to suggest Banjo Kazooie, too.Lordpils said:Viva Pinata so no.
Almost everything Nintendo are famed for making - excluding perhaps the Metroid series and Twilight Princess - can be added to a kid's game list - Mario, DK, Kirby, Star Fox, FZero and so on. Speaking of Nintendo, I saw someone mention SSB earlier, so I guess that counts, too.
Also - and as has also been noted - the LEGO games are pretty kickass. Aside from the Batman one which I didn't like too much. I suppose that's because I'm not a big comic-book guy in the first place, so maybe I don't get any of the in-jokes.