[@Cultural Titan]

No please, the more questions the merrier! 

It is flat. The facility is enormously large so that it would be considerably unlikely for a resident to actually find one of the walls or the ceiling. The residents don't know, or at least shouldn't know, that they're confined.

Yes. Also yes.

They have some basic traveling opportunities, a beach, forest to camp in and an artificial ski hill (feel free to suggest any others :p) but nothing that could really be considered foreign. When they arrive at care they remember nothing of the world so the Guides are meant to repeatedly remind residents that this is the only place that exists, theres no where else to go. So, brainwashing effectively.

There would be a few elderly residents but not many. Exceptional people are very rare and CARE residents aren't allowed to reproduce except under very specific circumstances (IE. studying exceptionality's affect on pregnancy etc.) There are other facilities around the world similar to CARE, though CARE is the largest and oldest, and as such new captures are spread pretty thin.

Man that required some thinking haha, I hope it all makes sense! If not let me know and I'll try and clarify... "Clear as mud" as they say and all. :P