Slovenia
One has to be at least 18 years to buy airsoft guns.
If the velocity of an airsoft gun is below 100 m/s (328 ft/s) i.e. equivalent to one joule, it is considered to be a toy. If the velocity is higher than 100 m/s (328 ft/s), the airsoft gun is classified as a section D firearm in the Firearms control legislation of Slovenia. Additionally Air Soft Clubs and National Shooters Association in Slovenia recommends that airsoft gun velocities should not be above 100 m/s (one joule).
Read more about this topic: Legal Issues In Airsoft