You will need to contact your local law enforcement for a current, correct and legal answer.
YES
in your own back yard, airsoft guns are legal on your own property to shoot, as long as your not shooting someone else who doesnt want to. its perfectly legal to shoot and use any airsoft gun no your own property.
Airsoft is legal in many countries. Any gun that shoots plastic pellets are airsoft guns.
NO you will get kicked out or shot by the police
No It's not but you must be 18 or older if your under I will suggest a airsoft gun
since an airsoft gun is considered a toy it is legal for any age but you have to be 18 or older to buy it
Yes, as long as you have the orange tip, you can have an airsoft gun. Otherwise the police could mistake it for a real gun and you could end up in jail or worse.
Well, the legal FPS for an airsoft gun is 450, but you can get snipers, AEG's, etc. that run up to 600 FPS and beyond.
An Airsoft gun
Due to some city regulations, it is best to keep the orange tip painted orange. Painting the rest of the gun in fine and legal. To receive more information on airsoft gun painting and use, contact your local police department (not 911).
You will need a lawyer to get a legal, correct and current answer depending on the specifics of your situation.
Besides the obvious (don't go around shooting random people, airsoft on public or private property without permission, painting the orange tip of the gun, etc.), no.