Estimate, Median Age by Sex, Total Population (5-year estimate) in St. Lucie County, FL was 45.30000 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 St. Lucie County, FL reached a record high of 45.50000 in January of 2020 and a record low of 41.90000 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 St. Lucie County, FL - last updated from the United States Federal Reserve on May of 2024.