Millions of U.S. seniors today collect benefits from Social Security. And a lot of them rely heavily on that income to pay their bills.

If you're still 20 or 30 years away from collecting Social Security, you may not feel the need to try to figure out what size monthly benefit you'll be in line for come retirement. And also, any estimate you make now may not be accurate, since you have many years of earnings ahead of you, and your income could change significantly for the better or the worse over those years.

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Source Fool.com