Estimate, Median Age by Sex, Total Population (5-year estimate) in Miller County, MO was 41.10000 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 Miller County, MO reached a record high of 41.40000 in January of 2016 and a record low of 39.00000 in January of 2009. 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 Miller County, MO - last updated from the United States Federal Reserve on May of 2024.