When people consider how they want their lives to be, they often think in terms of reaching specific milestones. They set goals like earning a certain amount of money, achieving a certain level of success at work, having a certain group of close friends, falling in love, getting married, having a spectacular wedding, having children, and being thought of as a good person. But milestones like these don't necessarily determine how much people enjoy their lives, how high their mood is on a regular ...