Estimate, Median Age by Sex, Total Population (5-year estimate) in Clay County, KS was 43.10000 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 Clay County, KS reached a record high of 44.30000 in January of 2011 and a record low of 42.00000 in January of 2016. 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 Clay County, KS - last updated from the United States Federal Reserve on May of 2024.