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As aforementioned, the assumption will be that anyone signing up in the members section of DGN will by of legal age. The "guest" area will consists of informative links, like a hub that can be viewed by anyone. Therefore, that section of the site will maintain a level of General Audience.
Knowing what kids know today, there's almost nothing on this site that they don't already know, haven't already experimented on or with, or aren't looking for more info on that's not already available to them elsewhere on the internet. Whereas I'm not in the business (anymore) of educating little kids, there's almost nothing you can do to stop them. But should it become blatantly apparent to the admin that someone is purely an immature child trying to pose as whatever age they listed, actions will be taken accordingly.
I can't predict how things will go as things have not been tested yet. Life is organic and there's always going to be something. Therefore, that bridge will be crossed upon arrival.