Estimate, Median Age by Sex, Total Population (5-year estimate) in Allen County, IN was 36.10000 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 Allen County, IN reached a record high of 36.10000 in January of 2021 and a record low of 35.10000 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 Allen County, IN - last updated from the United States Federal Reserve on May of 2024.