Nope, sorry there is no spectator mode in Battlefield 3.
Battlefield 3 has no option or game mode which allows split screen.
Yes there is no doubt about it.
no
Not legally.
No, you just have to look! Stupid!
No, the BF4 Beta is a separate download/installation.
About 25 pounds.
Now
No, you can be any age to play Battlefield 3.
battlefield 3
Go to multiplayer on the main menu
Dice, a branch of Electronic Arts