Martin Seligman is a psychologist. In his view; happiness and well-being are desired outcomes of positive psychology. He defines three types of life;
Pleasant Life: successfully pursuing and achieving the positive emotions of past, present and future. For example: satisfaction, contentment, trust, faith and comfort.
This state of life is risky because it can change quickly. For me this state is settling for less.
Good Life: using one's strengths and virtues to obtain abundant gratification in the main realms of life. As work, love and parenting. For example; going to your job with joy and not minding to do overtime.
Meaningful Life: using one's strengths and virtues in the service of something much larger than we are (a cause, a belief) As an example; doctors without borders, they live in really bad conditions without money, but they are doing for a good cause.
Giuseppe mentioned that, people may go back and forth with these stages, these stages are not linear, they don't follow each other. People have changes on their beliefs, goals during their lives so their style of life changes.