There's a reason so many people have a hard time determining how much of their savings to withdraw from each year in retirement, and why so many worry about depleting their nest eggs at some point in time. One of the biggest wild cards you'll encounter in the course of your retirement planning is not knowing how long you'll live.

Recent data from Northwestern Mutual reveals that 28% of Americans across all generations think it's likely that they'll live until age 100. And 40% of millennials and Gen Zers think there's a good chance they'll make it to their 100th birthday.

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Source Fool.com