It makes sense to have some kind of age restriction on a smaller guild, you want to play with people your own age and if your a small guild and your only going to have 4 or 5 members, makes sense to make sure that happens. I don't think you're doing anything wrong.
CB will house members from 18-48 at launch, so I'm more comfortable letting in a 17 year old because they're close in age to the 18 year old. I'm not sure how much I'd interact with the younger member out of the game, but I would know there are people near their own age they can interact with.
I don't know, it would be odd having a guild that was 25+ and letting in a 16 year old.
CB will house members from 18-48 at launch, so I'm more comfortable letting in a 17 year old because they're close in age to the 18 year old. I'm not sure how much I'd interact with the younger member out of the game, but I would know there are people near their own age they can interact with.
I don't know, it would be odd having a guild that was 25+ and letting in a 16 year old.