Some people might say that you'd get knocked back to the age you were before. I guess that's possible, but we have no way of knowing for sure.

[Riku shakes his head, drumming his fingers on his hips.]

Personally, I think it's just as likely that us being here creates... I don't know, some kind of split timeline. Something to set us apart from the people who pop up without memories, since Sora wound up disappearing, coming back as a blank slate, and then popping back later with memories from a previous stay.