There are more than enough games that can be fun for 30 years and older
Coming:
SimCity Creator - For fans of LEGO
Tales of Symphonia 2 - For Tolkien readers
Mushroom Men - For used-to-be hippies
Blast Works: Fuse, Build and Destroy - For old Arcade gamers
Fatal Frame IV - For those who've seen "The Ring"
Top Spin Tennis 3 - For the Tennis fan
Star Wars: The Force Unleashed - For the SW fan
Project O/King's Story - For those still in the middleages
Spore - For crazy biologists
We Love Golf - For businessmen with a bad handicap
De Blob - For designers with a lack of inspiration
Already there:
Boom Blox
Zack & Wiki
Fire Emblem
Guitar Hero
Super mario Galaxy
Okami
Zelda: Twilight Princess
Guitar Hero
Pro Evolution Soccer