I'm not that old. Most people would consider me young but I do learn from my experiences and I tend to be reflective and analytical. As I grow older, I see more and more that people are not content with what they have. There is always a hunger for more. If one is given a dollar, he wants five. If he's given five, he wants ten. If he's given ten, he wants twenty and so on.
It is rare to meet someone these days in the U.S. who will reflect upon his life and say, "I am truly satisfied with my life." This is not to say there is no such person. This type of person is rare.