what age do you have to be to own a gun
18 for long guns. 21 for hand guns. --- Actually, those are the ages for purchasing from a dealer. Federal law does not list an age limit for possession of long guns and lists â¦ 18 as the age limit for possession of handguns -- though you will not be able to buy ammo for a handgun until age 21.10 people found this useful.-- Actually, those are the ages for purchasing from a dealer. Federal law does not list an age limit for possession of long guns and lists â¦ 18 as the age limit for possession of handguns -- though you will not be able to buy ammo for a handgun until age 21. 10 people found this useful.