By the time they have turned eighteen, most Americans will have moved at least twice. Most thirty-year-olds will have moved six times. By the end of our lives, most of us will have pushed that number up to eleven. This highly mobile way of life is mirrored in our career habits as well.

The average American worker holds ten different jobs before the age of forty, and this job transience is only expected to increase in the years ahead. Add to these the slew of life changes such as college or vocational training, marriage, and having children, and it becomes clear how many different phases our lives actually have. For all of us there is only one thing that remains the same—the fact that nothing does.