A mature person is like a ripe fruit.
For example, a pear.
The pear is not perfect, but it has no desire to become something else. It doesn't try to turn from a pear into a peach with the help of personal growth training. It doesn't pretend to be a banana, who is just out of shape today. Not torturing herself with newfangled diets to the size of a cherry. It doesn't tell tall tales about how she looked like a little tangerine as a child.
It accepts herself as a pear. Somewhere with a rottenness, somewhere with a tough skin, and somewhere with an appetizing barrel. And certainly a characteristic pear shape.
So is a mature man. He's not perfect. He has already fought with his nature, despaired, disappointed, humbled himself, accepted, studied and started to use that which is inherent in him. That is why it looks harmonious in all its manifestations. And that’s not only the result of experience, but also of choice.