Other pages about the topic: Age data

Population by age, mapped by county

Median Age, 2018

In 2010, the median age of persons living in Washington state was 37.3 years. In 2018 the median age had increased to 38.3 years.

Jefferson County had the highest median age in 2010 at 53.9 years. By 2018, the median age in Jefferson County had reached 58.4 years.