De Kalb County, IN - Estimate, Median Age by Sex, Total Population (5-year estimate) in DeKalb County, IN was 38.10000 Years of Age in January of 2022, according to the United States Federal Reserve. Historically, De Kalb County, IN - Estimate, Median Age by Sex, Total Population (5-year estimate) in DeKalb County, IN reached a record high of 39.10000 in January of 2017 and a record low of 36.80000 in January of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for De Kalb County, IN - Estimate, Median Age by Sex, Total Population (5-year estimate) in DeKalb County, IN - last updated from the United States Federal Reserve on May of 2024.