I missed the original post and some followup comments, but I can guess at least part of it.
I am participating in a GB at the moment run by someone who is under age. So far so good - excellent communication and response, regular updates, and quick responses to queries. So far no complaints.
OTOH I have participated in GBs run by older persons which have been drawn out and severely lacked communication (for various reasons, some quite valid).
What about underage or new members need an established member or a mod as a mentor during the GB?
Not necessarily a guarantor, should things to arse over tits, but just someone responsible who can help or simply guide the GB organiser if things start to get too much for them, or unexpected situations arise for which there is not necessarily a precedent.