The nation experienced a certain shift in age distributions over the last decade. With baby boomers moving on to retirement, millennials and Gen Xers began to make up the bulk of the working population.

To determine where the different demographic groups are more concentrated, Trulia created a report to see where the youngest and oldest places are in America. The report broke down county demographics into three categories: young (ages 0-19), working age (ages 20-64) and elderly (65+ years).  The report also compared the demographic makeup of each U.S. county in 2017 to that of 2010 to provide a look at how certain areas have gained or lost residents of various ages.

Boston’s Suffolk County saw a decrease in its young population, but an increase in the elderly and working populations. The elderly population increased from 10.5 percent to 11.7 percent from 2010 to 2017. The working age population only saw a 0.2 percent increase to 67.4 percent by 2017. The young group dropped from 22.3 percent in 2010 to 20.9 percent in 2017. The median home value in 2017 for Suffolk County was $549,000.

On average, people in the elderly population concentrated towards the South. There was also a significant amount of older Americans in the Pacific Northwest and parts of New England. Utah was the state with the highest concentration of children ages 0 to 19, in line with the state’s higher-than-average birth rate.