Estimate, Median Age by Sex, Total Population (5-year estimate) in Roberts County, SD was 37.00000 Years of Age in January of 2022, according to the United States Federal Reserve. Historically, Estimate, Median Age by Sex, Total Population (5-year estimate) in Roberts County, SD reached a record high of 39.70000 in January of 2012 and a record low of 37.00000 in January of 2022. Trading Economics provides the current actual value, an historical data chart and related indicators for Estimate, Median Age by Sex, Total Population (5-year estimate) in Roberts County, SD - last updated from the United States Federal Reserve on May of 2024.