21
Three.
The state of Illinois does not issue carry permits, so it's illegal at any age to carry a gun in Illinois, assuming you mean out in public with a gun permit.
In PA you have to be 21 to conceal carry (or carry loaded in your car) a handgun.
18 to purchase
You must be 21 or older.
18+ but any age to wield it
You will have to define what you mean by carry, and which gun. There is a large difference between carrying a concealed handgun, and carrying a rifle or shotgun when hunting.
It depends on where you are and what you mean by gun license. If you are in the U.S. and you mean a permit to carry a gun, check the related link for information.
What kind of license? Where are you? What kind of gun? to carry a gun north America pistel It depends on where you are. In some states, you have to be 21 but in a few, you have to be 18.
You cannot openly carry paintball guns anywhere. you must keep it in a case, with gun, air and paint separate until you are home or at the field.
Depends on how the gun is carried, and what type of gun. You need to give us some information to get a meaningful answer. Every 18 yr old that goes deer hunting "carries" a gun in their vehicle.
No.