There are plenty of good reasons to hold down a job in retirement. First, the extra income can be nice to have. And for some people -- especially those without retirement savings -- it can actually be a must.

Also, work can serve as a social outlet in retirement. If you don't have friends who are retired, you might easily start to feel isolated if you're the only person you know not reporting to a job every day. And for some people, having a place to go a few days a week can spell the difference between being lonely and bored versus feeling happy and fulfilled.

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Source Fool.com