I feel like there's confusion regarding the word "mature". It's supposed to mean that someone has lots of experience and draws knowledge from it, but in reality often people use the word "mature" to describe a certain specific societal ideal of a person that we're supposed to grow into.

The problem is that societal consesus is often wrong, and that image of a perfectly mature person actually does have a lot of problems with it. Every generation discovers this, and redefines that ideal.

40 years ago in my country a "mature man" was expected to take part in alcohol drinking contests until blackout. Nowadays a "mature man" is expected to drink as little alcohol as possible.

Neither attitude is actually about learning and forming a personal, informed opinion, both of them are about following whatever is currently in fashion.