I agree with the Javascript suggestion, and if his primary interest is games - I recommend https://pragprog.com/titles/csjava2/3d-game-programming-for-kids-seco

I agree with the Javascript suggestion, and if his primary interest is games - I recommend https://pragprog.com/titles/csjava2/3d-game-programming-for-kids-second-edition/ https://pragprog.com/titles/csjava2/3d-game-programming-for-... It's a great, structured way to get some hands on experience while having fun!