There's always some uncertainty in retirement planning, because you never know what the future holds. But you can get a pretty good idea of how much you need to save as long as you have accurate estimates on a few key retirement stats, like how much you plan to spend in a year or how long you think your retirement will last. But if you get any of these key numbers wrong, they can throw your whole retirement plan off. 

It happens more often than you think. A recent TIAA study found that more than three in five workers messed up a critical retirement literacy question: What's the average life expectancy for a 60-year-old man and woman in the U.S.? Read on to find out if you're one of the few who got it right.

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Source Fool.com