According to a study released this past summer by the American Association of Retired Persons (AARP), some 42% of retired Americans are either working in retirement or plan to do so, while 57% of those nearing retirement plan to keep working.

What is driving this trend? Let's take a look at some of the reasons people are working longer -- and some points to consider when making that decision.

For many people, working in their retirement years is a necessity. That AARP survey said that 55% of those who are working in retirement are doing so for financial reasons. This may be because they were forced to retire early due to getting laid off, a company reorganization, or to care for their health or the health of a loved one, among other reasons. Some may feel they don't have enough, given the rise in inflation and the higher cost of living. 

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Source Fool.com