Can't see a category until user has a certain amount of posts?

How do I make it so that a user cant see a category until they have a certain amount of posts?

Hello,

a category it's self isn't possible, but a forum is, as that's where the posts go.
It will require Auto-Grouping

Admin panel >> Users & Groups > Groups Administration > Add new > Set minimal number to the desired number > Save.
Now head to the particular forum
Admin panel >> General > Categories & Forum, corresponding O and select only that group to see that forum > Save