One thing I've tempered a lot as I've aged is "criticism." No, I don't mean avoiding criticizing political arguments or figures, but easing up on criticizing people I meet or things I encounter. For instance, I used to be much more opinionated about movies or art, eviscerating things I thought were wrongheaded or poorly done. Now I realize that to create anything is difficult and a real accomplishment, and I tend to limit my thoughts to "not my cup of tea" or simply avoid things that are not my style. I don't criticize how other people lead their lives, or raise their children, or spend their money, or how they shave or why don't they comb their hair; even if it's in the form of a joke: to each his own has pretty much been my mantra (unless it hurts someone else), and I find myself much happier for not being so judgmental. Who am I to judge others all the time when I am hardly perfect?