https://www.themarginalian.org/2014/06/26/henry-miller-on-turning-eighty/
I have very few friends or acquaintances my own age or near it. Though I am usually ill at ease in the company of elderly people I have the greatest respect and admiration for two very old men who seem to remain eternally young and creative. I mean [the Catalan cellist and conductor] Pablo Casals and Pablo Picasso, both over ninety now. Such youthful nonagenarians put the young to shame. Those who are truly decrepit, living corpses, so to speak, are the middle-aged, middleclass men and women who are stuck in their comfortable grooves and imagine that the status quo will last forever or else are so frightened it won’t that they have retreated into their mental bomb shelters to wait it out.
One thing seems more and more evident to me now — people’s basic character does not change over the years… Far from improving them, success usually accentuates their faults or short-comings. The brilliant guys at school often turn out to be not so brilliant once they are out in the world. If you disliked or despised certain lads in your class you will dislike them even more when they become financiers, statesmen or five star generals. Life forces us to learn a few lessons, but not necessarily to grow.
I was cursed or blessed with a prolonged adolescence; I arrived at some seeming maturity when I was past thirty. It was only in my forties that I really began to feel young. By then I was ready for it. (Picasso once said: “One starts to get young at the age of sixty, and then it’s too late.”) By this time I had lost many illusions, but fortunately not my enthusiasm, nor the joy of living, nor my unquenchable curiosity.
One can fight evil but against stupidity one is helpless… I have accepted the fact, hard as it may be, that human beings are inclined to behave in ways that would make animals blush. The ironic, the tragic thing is that we often behave in ignoble fashion from what we consider the highest motives. The animal makes no excuse for killing his prey; the human animal, on the other hand, can invoke God’s blessing when massacring his fellow men. He forgets that God is not on his side but at his side.