Estimate, Median Age by Sex, Total Population (5-year estimate) in Blaine County, MT was 33.60000 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 Blaine County, MT reached a record high of 35.30000 in January of 2010 and a record low of 33.50000 in January of 2020. 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 Blaine County, MT - last updated from the United States Federal Reserve on May of 2024.