The time and setting where this RP is taking place, the world is united under one banner. There is no 'every country', for there is just a single 'country'; Mankind. While this obviously wouldn't work in the real world, things are desperate in this setting.

The reason of the specific age range is because I wanted it to be under 18, but I didn't want it to be so young that it got uncomfortable for other players, and another reason for the young aged pilots is because of the fact that I want to have things somewhat similar to Evangelion with adults using children to accomplish their needs despite the cost of things. This is also sort of what I had in mind for the plot of the RP.

Basically, think of it from an animated stand point or, in specific, Evangelion's standpoint.