Some may say that gambling is not a very good idea especially for an 11 y/o, but the son of a friend of mine has started playing poker online once. He's moved from the simplistic "video" poker, to the somewhat real one with real players (everything over internet, online). With $100 from his piggy bank at the beginning he's made around $16K in about 5 months. I don't know about the particular web site or any other specifics though. And it seems to me he was 15 at that time. He used the money to pay (partially) for the college (where he is now).