Ok, so here is what I now know as fact:
I called the Charlotte police department with a hypothetical scenario of a 12, 13, or 14 year old driving a motor vehicle on national forest roads, they didn't know. Suggested I call NC DMV headquarters in Raleigh. I spoke with them, they couldn't confirm, suggested I call US National Wildlife. They couldn't confirm and said each state was different, suggested I call NC Wildlife and speak with their law enforcement division.
They knew right away: Uwharrie is federal property and they have adopted NC driving laws, along with all other national forests in NC. You must be 16, you must have a valid drivers license. If you are under age, or operating on a expired license, you are ticketed. Doesn't matter if it is gravel, or dirt.
Black and white. All that said, I would ask around the local clubs and see what they would allow- IE The Farm, The Flats, DPG.
I'm not raining on a parade, because I will be in the same situation.