No,
There is no such thing as a gun license in the US. There are concealed carry permits/licenses and dealers licenses.
It depends on what you mean by license, and where you are located. If you mean a permit to carry a gun, in most U.S. states, the minimum age is 21.
16
To get a gun license you would need to go into a gun store in the town you live in and ask for the information you need.
Contact your local police.
There is no minimum age.
No ... but their may be an age requirement.
14 years old
Contact your local police for current information.
WITH permission of your parents, and under adult supervision, any age.
You will have to contact your local police. NY has a patchwork or laws.