I believe it will have become evident why, for me, adjectives such as happy, contented, blissful, enjoyable, do not seem quite appropriate to any general description of this process I have called the good life, even though the person in this process would experience each one of these at the appropriate times. But adjectives which seem more generally fitting are adjectives such as enriching, exciting, rewarding, challenging, meaningful. This process of the good life is not, I am convinced, a life for the faint-fainthearted. It involves the stretching and growing of becoming more and more of one's potentialities. It involves the courage to be. It means launching oneself fully into the stream of life. Yet the deeply exciting thing about human beings is that when the individual is inwardly free, he chooses as the good life this process of becoming.
If you look around at your family and friends, you will see that the happiest people are the ones who don't pretend to know what's right for others and don't try to control anyone but themselves.
The average level of happiness increases in old age; fewer negative emotions occur and, when they do, they don’t persist as long. Connected to this, brain-imaging studies show that negative images have less of an impact, and positive images have more of an impact on brain metabolism in older people, as compared to young.
Dixxit 
