Estimate, Median Age by Sex, Total Population (5-year estimate) in Smith County, KS was 50.00000 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 Smith County, KS reached a record high of 51.60000 in January of 2017 and a record low of 49.90000 in January of 2010. 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 Smith County, KS - last updated from the United States Federal Reserve on May of 2024.