The stock market has been extremely volatile this year, and that may have some retirees worrying about their long-term financial prospects. Granted, seniors are often advised to maintain a more conservative investment mix than they did during their younger years. But even so, an extended bout of stock market turbulence could put seniors' nest eggs at risk.

While poor stock market performance may seem like a huge risk to seniors -- perhaps the greatest risk they bear -- there's another more-pressing threat that could compromise their long-term financial security, according to recent research from the Center for Retirement Research at Boston College. And it's a threat that today's workers should take steps to address.

The fact that Americans are living longer these days is a good thing in theory. But from a financial standpoint, it poses a challenge.

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Source Fool.com