Median Age, Change, 2000 to 2010
The median age in Arizona rose 1.9 years between 2000 and 2010, the same increase as the national average. Six Arizona counties had an increase of more than 4.5 years: Gila, La Paz, Mohave, and Yavapai counties have a high and rising proportion of retirees, while the percentage of children fell significantly in Apache and Navajo counties, each of which has a large American Indian population. Two counties experienced a decline in the median age. Yuma County’s decrease was marginal while Pinal County’s decrease resulted from the northern part of the county becoming a suburban area to Phoenix, with many young working-age families moving to the county.