“The proportion 65 years and over in counties followed regional trends.
Figure 3 shows the proportion 65 years and over of each of the country’s 3,141 counties and equivalent areas. The broad patterns evident on the map include a high proportion of people 65 years and over in counties extending through the Great Plains and south into central Texas. Many of these counties had a proportion of people 65 years and over that equaled or exceeded the proportion of the older population in the state of Florida (17.6 percent). The presence of this band in the Midwest suggests that the trends of out migration of the young and aging-in-place have continued in this region. A similar band of counties with high proportions of older people is found in the Northeast region, stretching along Appalachia. By contrast, much of the West region consists of counties with lower proportions 65 years and over than the U.S. proportion of 12.4 percent, in part a result of higher net immigration and fertility.”