Best to start them early. Redditor Pypok and his wife needed a theme for their son's nursery, and Pypok suggested space (by way of Kerbal Space Program). Turned out rather well, I'd say—perfect for a future space explorer. There are some in-progress photos in the embedded Imgur album below.
“He’s not going to play the game until he’s in college.” The actor who plays Michael in Grand Theft Auto V tells GQ that his 11-year-old son will have to wait a while before sampling the pleasures of Los Santos. Kudos, Ned Luke, for having more sense than some of the other parents out there.