„Maturity is not a matter of age. You have matured when you are no longer concerned with showing how clever you are, and give your full attention to getting the job done right. Many never reach that stage, no matter how old they get.“

— Thomas Sowell

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„How old do you have to get before wisdom descends like a plastic bag over your head and you learn to keep your big mouth shut? Maybe never. Maybe you get more frivolous with age.“
— Margaret Atwood
„The years nineteen and twenty are a crucial stage in the maturation of character, and if you allow yourself to become warped when you're that age, it will cause you pain when you're older.“
— Haruki Murakami
„The potential sacrifices itself if you don't utilize it as you mature, and you just end up a 40 year old lost boy, which is a horrifying thing to behold. It's almost as if you're the living corpse of a child, because who wants a six year old 40-year-old? You're a little on the stale side by that point, and you're not the world's happiest individual. Your potential is going to disappear because you age anyways, so you might as well shape that potential in a particular direction and at least become something, no matter how limited, rather than nothing.“
— Jordan Peterson
„i>Age and truth. Young people love what is interesting and odd, no matter how true or false it is. More mature minds love what is interesting and odd about truth. Fully mature intellects, finally, love truth, even when it appears plain and simple, boring to the ordinary person; for they have noticed that truth tends to reveal its highest wisdom in the guise of simplicity.“
— Friedrich Nietzsche
„Most people don't grow up. Most people age. They find parking spaces, honor their credit cards, get married, have children, and call that maturity. What that is, is aging.“
— Maya Angelou
„Age is not a particularly interesting subject. Anyone can get old. All you have to do is live long enough.“
— Groucho Marx