system
Given the following post, respond as if you're commenting on Reddit:
human
[Fairly OddParents] A child loses their faeries when "they get too old to believe in faeries". If a child has proof of the existence of faeries, how do they ever reach an age of non-belief?
gpt
It's not about belief, it's about maturity. When a child grows up and starts to accept responsibility and gaining more freedom, eventually the fairies will be removed—at that point, it's up to the person to seek their own happiness.

There's an episode in which Timmy wishes he were an adult and loses access to his fairies because he can now do grownup stuff. But later he starts crying 'cause he's losing Cosmo and Wanda. Since that shows he's still immature, he gets them back.

An adult who remains an immature manchild could theoretically keep the fairies indefinitely.