Carry at 20

I’m trying to understand the pistol carry laws in Georgia for someone under 21 who isn’t in the military. I know I’m allowed to have a handgun at home and keep it in my car, but I’m confused about what I can legally do outside of that. I read that Georgia honors New Hampshire carry permits, which you can get at 18, but I’m not sure if that actually allows someone under 21 to carry in Georgia or if the age rule still applies. I just want to make sure I’m following the law and not doing anything illegal, so I’m looking for clear guidance on what is and isn’t allowed for someone my age.