I'm 15, started using them at 14. I fell, but let him know that *every* single time, it was below 3mph. It isn't dangerous, it's fine. I took me about two weeks to get used to them. Set the tension to low and practice clipping in and out before going on the road, and you'll be fine. I did find it much easier to bike. If you need me to tell him something from a teen's point of view let me know.