De Kalb County, TN - Estimate, Median Age by Sex, Total Population (5-year estimate) in DeKalb County, TN was 42.10000 Years of Age in January of 2022, according to the United States Federal Reserve. Historically, De Kalb County, TN - Estimate, Median Age by Sex, Total Population (5-year estimate) in DeKalb County, TN reached a record high of 42.60000 in January of 2020 and a record low of 39.20000 in January of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for De Kalb County, TN - Estimate, Median Age by Sex, Total Population (5-year estimate) in DeKalb County, TN - last updated from the United States Federal Reserve on May of 2024.