Should there be an age limit for catnip?

There are age limitations on most drugs for humans. Why not for cats?

I didn’t let my cats try until they were 1 yr old. They got it for they’re birthday (2 are twins from same liter. )

I felt that they shouldn’t have it as kittens.

Am I just a weirdo?

I mean. You know the catnip is a drug, but the cat ,at first, doesn’t.
So. You’re drugging your pet essentially.