Estimate, Median Age by Sex, Total Population (5-year estimate) in Boise County, ID was 53.40000 Years of Age in January of 2024, according to the United States Federal Reserve. Historically, Estimate, Median Age by Sex, Total Population (5-year estimate) in Boise County, ID reached a record high of 54.40000 in January of 2020 and a record low of 45.20000 in January of 2009. 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 Boise County, ID - last updated from the United States Federal Reserve on April of 2026.