Median age is the age at which half the population is younger and half is older. A lower median age indicates a relatively younger population, while a higher median age indicates a relatively older population.
The median age in Jefferson . . .
- was 31.9 in 2019, compared to 28.8 in 2000, 26.4 in 1990 and 24.0 in 1980;
- was 31.9 in 2019 compared to 36.9 in Idaho;
- ranked 42nd - from highest to lowest - out of Idaho's 44 counties in 2019.