Well, they do age here, but once they go back home, it's all reversed.

[She shakes her head; it sounds crazy, there's no easy way to get around that.]

Like Shikamaru did. He was sent home, and then came back here again after a short while. And because he'd been here so long... when he came back, he'd actually gotten physically a little younger. I don't understand how it works -- I can't even begin to imagine.

[She hesitates, then decides it does need to be said, and the sooner the better.]

It also... means that there are people here who aren't alive anymore, in the times we remember.