I say it depends on the skill/maturity of the kids. For example, all of the higher ranking kids at my school somehow manage to be mature, skilled teachers for an hour and a half. But I have seen schools with hyper little rascals darting about, and I have my doubts about being taught by them. If the kids can teach as well as an adult, (somewhat rare, but I've seen it happen) I have no qualms about being taught by them. I guess same goes for your club.