No matter what you think or have been led to believe; in spite of your own self-perception and enumerated redoubtable characteristics; and irregardless of the greatness of your heroic profession, NO HUMAN BEING FULLY MATURES. That is an irrefutable and incontestable fact. Our mannerisms may have changed, our voices may have changed, who we go running to for safety might have changed, but that sophomoric quality of our characters that guided and formulated the play-ground rules in elementary school is still very much a part of who we are.
What is it like to be FULLY mature? No one knows because no one's ever been there. There are certainly degrees of maturity, but the condition of a perfectly mature individual is one that will forever be elusive to us as a species. And if you care to observe this phenomenon in a closer inspection, you will note that this type of perpetual adolescence permeates virtually every aspect of our global societies.
Just an observation.