Retirement is a big problem for many Americans. According to a recent poll from BlackRock, just 56% of people believe that they will be able to retire comfortably and have the life they want in their golden years.

One way you can improve your financial position in the long run is by generating dividend income. And you can accomplish that by investing in strong businesses that not only pay dividends today but that are also likely to increase them in the years ahead.

Three dividend stocks that are among the safest options for including in your retirement plan now are UnitedHealth Group (NYSE: UNH), Apple (NASDAQ: AAPL), and Walmart (NYSE: WMT). They may not offer high yields, but here's why they may be worth investing in anyway.

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Source Fool.com