He makes an amused noise but there's a strain to it, and to his smile. It was okay for little kids to say that. That's what they were supposed to say-- better than racing ahead through life.

But it's a lie that he wouldn't want her to get old. Or Peter, if he can. Or himself if he could. Getting jealous of greys and wrinkles wasn't something he expected in his youth, but so it went.

"In that case, you better sleep. The less you rest, the faster you age." He nods sagely.