Over the last 20 years, the median-age for Americans (the median age is the point where exactly half the population is older and the other half is younger) has increased by about 3 ½ years. Today, the median age is 38.8 years. But just last year, the national median increased the most, as we saw the largest single year gain of 0.3 years in 2021. Our population is getting older overall.