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 Gem . . .
- was 44.2 in 2018, compared to 37.5 in 2000, 36.0 in 1990 and 31.3 in 1980;
- was 44.2 in 2018 compared to 36.6 in Idaho;
- ranked 16th - from highest to lowest - out of Idaho's 44 counties in 2018.