Estimate, Median Age by Sex, Total Population (5-year estimate) in Knox County, ME was 49.00000 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 Knox County, ME reached a record high of 49.00000 in January of 2022 and a record low of 44.80000 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 Knox County, ME - last updated from the United States Federal Reserve on May of 2024.