Estimate, Median Age by Sex, Total Population (5-year estimate) in Allegheny County, PA was 40.60000 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 Allegheny County, PA reached a record high of 41.20000 in January of 2011 and a record low of 40.60000 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 Allegheny County, PA - last updated from the United States Federal Reserve on May of 2024.