As for Alaska, they are not as heavy on the rules of light air guns as actual handguns. So, there will not be any age restrictions to buy guns and the area where you can shoot airsoft.
However, the designated area to start playing airsoft is usually a park, and you can shoot here on the hunting grounds.
That said, it doesn't mean that it's easy to use light air guns in Alaska.
Specifically, in Anchorage - a city in the state of Alaska, where the presence of light air guns is not acceptable, they assessed the level of influence between air guns and firearms as such. Therefore, this type of real gun is banned in this city, and they only appear in shooting ranges