If you decide to create a multiplayer game... it should be safe to say, it should require ID to prove you're over 18. I'm sorry, but it shouldn't be safe if children under 18 play this game. this could open up a whole new world of opportunities for weirdos..
Considering the fact that children under 18 have (more than likely) lied about their age in the past while registering for accounts to play a single or multiplayer game, I think this would be a good idea. And I've seen this done before with two of my nephews when they were younger.
EA would never do anything that would raise the games current rating of teen as there are many players in that age group.
