The average senior gets about $1,673 per month from Social Security, which comes out to just over $20,000 per year. That's a huge boon to families living on a fixed income, but it's not enough to provide most people with a comfortable lifestyle. Those who live in places with high costs of living may be especially disappointed in how far their Social Security checks go.

It would be great if we could all live off Social Security alone in retirement, but that's just not realistic for most people. Here are three reasons why.

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Source Fool.com