Estimate, Median Age by Sex, Total Population (5-year estimate) in Smith County, TN was 40.50000 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, TN reached a record high of 41.60000 in January of 2015 and a record low of 38.80000 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, TN - last updated from the United States Federal Reserve on May of 2024.