Teenager is such a stupid term (a rather recent one at that) meant to keep young but GROWN human beings in a permanent state of adolescence, best way to achieve that is to A: treat them like children B: Not give them responsibility AND the authority to exercise the responsibility with, then follow up with no accountability.
Anyway....
As for Divemaster, either you are or you are not. IF the student is considered too young (and or immature) you wait until he is considered of an age (and or mature) at which point he can become Divemaster, not some half ass diluted nonsense that IS nothing but a money grab, and a disorder caused by a policing control freakish nanny state mentality where everyone is to be controlled and kept "safe" by government or some agency acting on behalf of government.
Edit
England of course, why am I not surprised.
Anyway....
As for Divemaster, either you are or you are not. IF the student is considered too young (and or immature) you wait until he is considered of an age (and or mature) at which point he can become Divemaster, not some half ass diluted nonsense that IS nothing but a money grab, and a disorder caused by a policing control freakish nanny state mentality where everyone is to be controlled and kept "safe" by government or some agency acting on behalf of government.
Edit
England of course, why am I not surprised.