First off, sorry for the spelling difficulties in the first post. I have two fingers taped together and that makes it a little hard to type. I'll be more careful.
The disparity of ages is to show the differences between the young, relatively unaffected child who can still hobble around and can't really lift more than five pounds mentally, and then one in between who is semi-immobile but more powerful, and then one who is pretty much a lump of paralyzed flesh that is strong mentally but pre-occupied more with things like breathing. If you think it'll work better with a smaller number that's another thing.
The principle of blinding them is that they cannot move something if they have no sense of where it is going in space. They can still manipulate their own bodies thanks to proprioception, but they wouldn't be able to do more than bash things randomly.
As for why telekinesis, I just though it would fit better with the idea than, say, telepathy or something else like that.
Okay, second idea.
It would be a virtual reality simulation of the type you would view with haptic feedback, thus the reference to graphics. When I mentioned it becoming more lifelike, I meant that you would start feeling things beyond the capabilities of the haptic or the simulation system such as, if you happened to pick a piece of it up, the texture of a moon rock. If you licked it (not that I could imagine why you would) you would get a gritty grose taste in your mouth, and so on.
You explore it by walking around in the virtual simulation. As the simulation becomes more like you're actually walking on the moon, it leads to explosive decompression as a natural resul of walking on the moon without a space suit.