I think children can benefit greatly from meditation too. It isn't really the complicated mystical experience some make it out to be. I think kids "get it" as most of them are naturally intuitive.
This is how I taught my kids to meditate. "Close your eyes, be still and quiet. Pay attention to how many sounds you can hear. Now stretch your hearing as far as it can go, notice each sound without feeling anything about it, and keep trying to hear further and further away from you."