Here's the life cycle of a typical human: go to school, study hard, get a good job and have a family; continue working, save up for retirement then wait until you die. There is really nothing wrong with this arrangement if it's something you enjoy. But a lot of people become disinterested a few years into their jobs. They just feel like the job is sucking away their lives. They rarely have time for friends, family or any fun activities. Literally, they are stuck.