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Keep in mind that, just as you adjusted to the time away from your family while at work, you will adjust to being around your family on a full-time basis. Many people find this transition to be positive but still enjoy independent hobbies or clubs.
4. How do I give up my career when I believe it partially defines me?
Most people are identified by their career. It's who they are. When you leave the workforce, you are giving up that aspect of your identity. For example, someone who is a financial planner becomes known as the "numbers guy," and when he retires, he leaves that identity behind.
Those who become accustomed to spending hours at the office may find it difficult to turn off their work-mode switch and get used to a more laid-back or relaxing lifestyle. Over time, they may start to enjoy having more free time and find retirement a nice change from the day-to-day stress they experienced in the workforce.