St. Louis City, MO - Estimate, Median Age by Sex, Total Population (5-year estimate) in St. Louis city, MO was 36.50000 Years of Age in January of 2022, according to the United States Federal Reserve. Historically, St. Louis City, MO - Estimate, Median Age by Sex, Total Population (5-year estimate) in St. Louis city, MO reached a record high of 36.50000 in January of 2022 and a record low of 33.90000 in January of 2011. Trading Economics provides the current actual value, an historical data chart and related indicators for St. Louis City, MO - Estimate, Median Age by Sex, Total Population (5-year estimate) in St. Louis city, MO - last updated from the United States Federal Reserve on May of 2024.