This answer gives Dorin pause. He can barely remember that time of transition in his own life, so it's difficult for him to fully understand what that must've been like. But he can remember plenty of students that had struggled with leaving people and possessions and parts of themselves behind when they'd started at a Liminal school, so he can understand that much and he finds himself feeling sympathy for the uprooted younger Jack. Hopefully, things had gotten better after that. Though Jack hadn't actually said that, had he?

He's still trying to figure out what to say when the question prompts him back into the conversation.

"Oh. Yeah! I was six," he agrees, seeming a bit startled himself. But only because Jack is. What are they startled about?