I didn't think that through carefully enough. When I was saying responsible diver and dive buddy, I wasn't envisioning a 10yo being able to rescue an adult; but being able to do things like:
- thumb a dive because they're uneasy even though that might disappoint Dad/Mom- follow directions underwater, and stay with the group
- understand that the consequences of failure are not artificial punishments, but real, irrevocable damage to their bodies up to and including deathSpeaking of my own kids, I have a 12yo who is, in my opinion, responsible enough but not interested enough; a 10yo who is interested enough but not yet level-headed enough; and a 7yo who I'll be amazed if I think he's ready to dive before he's 18.
So I guess "it depends" is, truly, the answer. How I solve my problem in a way that seems "fair" ... well, I won't have to deal with it for a few years, as that seems like how long it'll take for the 10yo (the one who's really excited about it and wants to know if I think he'll be a good diver) to actually be ready to take the plunge (wife permitting).
Thanks for all the thoughtful responses so far,
Osric