Through the years, I haven't thought much about retirement. I should have planned ahead, but I could never imagine calling it a day. I have some friends who started planning back when they were in their 20s. Most people stay where they've been living, but experts say you may need to move to get the most out of your golden years. I never thought about where to live when it's time to retire. But, because of taxes and the cost of living, your money goes farther in some states versus others. The best state to spend your retirement...