These two maps show the share of Iowa county population aged fifty and over (percent) in 1990 (left panel) and 2010 (right panel).
You can see a distinct aging of our population in the last twenty years. Now Story, Polk, Dallas, and Johnson counties are the only counties with less than thirty percent of their population of fifty and over. These counties along with Warren County make up our five fastest growing counties. Two of these counties are the home of our major universities.
For reaching the state for Christ, this data is helpful for church leaders as they develop their community ministry and their expansion.
To see the map of the full USA, click for Joint Center for Housing Studies of Harvard University here.