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21. Idaho

Idaho is a great choice for those looking for a lot of opportunities to get outside and enjoy nature. This makes sense, considering it's situated between the states of Washington, Oregon, Montana, and Wyoming. The state has a population of 1.9 million people, of whom 315,400 are 65 or older. Sales tax is 6%, and the cost of living is 5% lower than the national average, making it attractive economically.

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The main downside for most might be that its biggest city is Boise, which isn't small but also isn't as large or bustling as some people might like.