Close to 100,000 Americans alive today are at least 100 years old. That means they've lived through 17 or more recessions, and they've seen a minimum of 18 U.S. presidents in the White House.

But there's at least one thing they haven't experienced as much as you might think: The S&P 500 just did something it's only done seven times ever. 

Image source: Getty Images.

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Source Fool.com