Median Age, 2009-to-2013 Average
On average between 2009 and 2013, the median age in Arizona (36.3) was a little less than the national average (37.3). In populous Maricopa County, the median age was only 35.0. The lowest median was in Coconino County at 31.0. In four counties — Gila, La Paz, Mohave, and Yavapai — the median age exceeded 47.