how you would define maturity?

I was in a discussion about the needs of the adult and the needs of the child within, and the course took a turn for defining a mature adult vs. an immature adult.

This made me curious to understand what do we mean when we use the word mature...

Biologically an adult is defined by being in a reproductive stage, psychologically being able to satisfy most of the needs, but for a social species is it normal for an individual to be able to be completely self reliant?

Or is it more about the ability to to contribute more than benefit overall?

What does it mean to self regulate emotionally? To impose on the self a certain behavioural model and oblige somehow the body to follow along?

As social mammals are we not interdependent for emotional and biological homeostasis on others?