Maybe?

I have a theory, what if time actually does go by... あなた may be thinking "you're crazy" but let's think about it so let's say Peter Pan is 12 and 1 秒 goes によって for everyday here on earth it would take 60 days just to reach a full 分 now × 365 (a year) によって 86400 (the time of 秒 in a 日 that would be equal to 31536000 (the time of 秒 in a year) so now × 31536000 によって 60 and あなた would get 1892160000 (how many 秒 in a 年 for Neverland Time) so in 50 Never land years that would be equal to 94608000000 years in Earth Time so peter would still be 12 in 50 of our years, so what I'm meaning about this is Peter does age just time is way slower than the time that we have.

Welp that's just my theory!