A few years. The adults wake up every now and then, but I can handle things when they're asleep.

[Multiple more lies, but he certainly talks with much more confidence than an ordinary boy his (apparent) age.

They soon enter through a huge automatic door into a scene that's like a dazzling burst of colour after all that white: a huge glass dome of blue sky, warm artificial sunlight, grass, and trees. It's like being transported to another world -- the old world, or what little is left of it.]

This is one of the gardens. We're growing things here to take to whichever new planet we settle on.