That's a really neat idea and it's good to see that the school has some corporate partners in the project so that it's not all classroom work.
I was probably somewhere around 12 or 13 when I started grilling for myself. My dad would cook everything well-done and by that time I liked my beef rare (and my burgers raw), so I would cook my own dinner or at the very least try to supervise and tell him when my burger or steak needed to be turned or taken off. Not that that approach ever worked very well, because he'd still drag his feet and insist that it needed to be cooked more.
I don't think it's ever too early to expose kids to live-fire cooking; obviously they'd be heavily supervised early on, with the level of supervision decreasing as their skills improve. For me, the best moment wasn't when my dad first let me cook on my own but when he let me light the grill for the first time. With his oxyacetylene torch.