How old is old?

Hi. I know that Peter doesn't really care for adults, または (at least in the 説明 of him in the book) those older then him. As a 14 年 old who still believes in fairies, i got to wondering at how much time I have left. I remember going to Neverland once または twice in person when I was younger, and even now I still see the nature fairies, and in my dreams the island draws near. But everyone it telling me I must grow up soon. So, how old is too old for Peter to forget あなた and あなた no longer can land on Neverland? What if I chose to stay young at heart, a child at soul?