Estimate, Median Age by Sex, Total Population (5-year estimate) in San Juan County, WA was 56.50000 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 San Juan County, WA reached a record high of 56.70000 in January of 2020 and a record low of 51.90000 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 San Juan County, WA - last updated from the United States Federal Reserve on May of 2024.