You don't get old by dying, Koji-kun. That's only if you survive.

They come again for the teenagers. Those that are healthy and can be taught. If they don't want you, you can stay Outside. And when you get too old to work Inside, you get sent Outside, and if you cause trouble, you're sent Outside.

I don't know about human, but you looked like a man. All dressed in White and your hair so pale that you kind of look like part of the walls at first.
You're Outside too, the Sheriff of our sector. [Still scary, but somewhat more human at least.]