It has nothing to do with one person over another.
Anyone who is under the legal age is not allowed to use Fandom. This is in line with a United States federal law known as COPPA. No exepctions. (And it's not only Fandom, it's all online sites. Including Facebook, Twitter, Discord, etc).
~Quote from Fandom Staff.
But now that you're old enough to be on here, you're fine. Nothing to worry about anymore.