Nobody has mentioned the midwest. I believe it was Conde Nast or another travel organization which rated Ann Arbor, Mi as the #1 retirement destination. I don't live there but have lived in Illinois, Kansas City, Greenville, Sc and Atlanta as well as visiting most of the cities in the country. I live in Kalamazoo and enjoy most of the same benefits as Ann Arbor: major university, stable white collar industry, four seasons, skiing, abundant lakefront properties, wine country, a bike friendly community and all four seasons to enjoy at midwestern prices.
Marc