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20. New Mexico

Like Arizona, New Mexico has emerged as a retiree hotspot in the Southwest over the past couple of decades. There must be something about the peaceful desert vibes and sunny weather. The state is home to some pretty vibrant cities, as well as locations that are incredibly remote. After all, this is the state where the first atomic bomb was tested. Today, New Mexico's population sits at 2.1 million, with 388,500 residents 65 or older.

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Sales tax is 5%, and the cost of living is lower than the national average, although the state does have some odd tax laws that should be researched if you plan on moving there.