http://www.ct.gov/bfpe/site/default.asp
I think that might have the answer. Just use google to find it.
Dunno... but in England, you can own an air rifle with an operating pressure of 12 ft lbs or less, or an air pistol of 6 ft lbs or less at any age, but you cannot buy one until you are 14... you cannot own more powerful air guns or live ammunition guns until 18, and then only if you have a Firearms Certificate issued by the police, and belong to a gun club or can prove that you need the gun for work... except for air pistols, where it is illegal to use or own any air pistol that runs off a separate air cartridge....