Why don't you sell to someone that's 18 years old?maybe it’s because a proof or record does not need to be obtained as evidence?
In other words Ga law doesn’t require a seller to gain proof ( not to my knowledge anyway)
I simply ask 3 questions.. and anyone who has met me can tell you I ask all 3 questions..
1. are you a Ga resident?
2. are you over 18?
3. are you legally able to own a gun?
If they answer yes to all 3 questions, I hand them their new gun..
to my knowledge Ga doesn’t require a seller to collect “proof” of any of those 3 things..