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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.
Yes because it is technically a gun
No,
There is no age limit.
In US - no. In UK - yes. In Australia - yes.
there is no age limit.
10 maybe
You need to be responsible enough not to abuse a spear gun and large (strong) enough to load the spear gun and use it safely. To the best of my knowledge there is no age limit in Australia.
There is no such thing as a gun license in the US. There are concealed carry permits/licenses and dealers licenses.
Contact your local law enforcement officials.
There is no set age limit for cap gun ownership.
Australia requires you to have a category "A" firearm license to own a BB gun