Estimate, Median Age by Sex, Total Population (5-year estimate) in Montgomery County, KS was 40.20000 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 Montgomery County, KS reached a record high of 40.90000 in January of 2009 and a record low of 39.40000 in January of 2015. 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 Montgomery County, KS - last updated from the United States Federal Reserve on May of 2024.