i assume you mean Battlefield 3, as Bad Company 3 hasn't even been confirmed yet, let alone have a release date.
battlefield 3
modern warfare 3, battle field bad company 3, call of duty 4
DICE, the swedish developer who made bf3, a company working for the games distributor EA
Yes there is no doubt about it.
no
Not legally.
There is no official release date for battlefield bad company 3 because the battlefield series has just made battlefield 3. But I'm sure there will be a battlefield bad company 3 because the bad company series have been very successful in making good games.
No, Battlefield 3 does not follow the Bad Company series storyline. Battlefield 3 is a sequel to Battlefield 2.
No, the BF4 Beta is a separate download/installation.
Now
About 25 pounds.
No, you can be any age to play Battlefield 3.