If they are planning on hunting you should start them early. 9 would be a good age
It may cause problems with jamming. It is not recommended.
No recommended, Not designed for plastic BB's.
Not recommended unless the owner's manual says so.
In the US, State law generally requires you be 18 to BUY a pellet gun. It is up to your parents to decide if you can have one, and you are under 18.
No ... but their may be an age requirement.
Any age so long as you have adult supervision who know firearms.
It depends on the model and the caliber of the Pellet gun.
all you have to do is buy the gun after that do what you want
I think you mean pellet gun. That is a gun that fires a small lead pellet but does not use gun powder. It uses compressed air or compressed gasses to push the pellet.
In the Unites States you have to be 18 to purchase a pellet or BB gun, but you can be any age to shoot it under adult supervision.
You can purchase .177 pellets at most any sporting goods stores. "Big 5,"' Dicks" or Wallmart just to name a few. As for the age of the Pellet gun you will have to give more information about the "GUN" (It not a rifle?) to determine the age. If you are asking about the model 177 then it was made between 1935-41
A pellet gun is not adequate for protection, and will get you arrested.