In the movie Hook (1991), when Peter finally starts to remember his past, it shows him "running away" from home as a baby younger than a toddler. Unable to walk, talk, etc. Tinkerbell finds Peter in the rain and takes him to Neverland. We then see him return to his family who has forgotten him, and at this point he is around 6 or 7. Then as we see other flashbacks of him visiting Wendy, he is an older adolescent, around 12.
Probably one of the most famous magical qualities of Neverland is that you don't grow old there. So if you don't grow up in Neverland, why/how did Peter grow from a baby to a 12 year old?
NOTE: I'm NOT talking about Peter growing old and becoming a lawyer. He ages before he decides to leave Neverland and that is what I'm curious about.