Estimate, Median Age by Sex, Total Population (5-year estimate) in New Haven County, CT was 40.40000 Years of Age in January of 2021, according to the United States Federal Reserve. Historically, Estimate, Median Age by Sex, Total Population (5-year estimate) in New Haven County, CT reached a record high of 40.50000 in January of 2020 and a record low of 38.10000 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 New Haven County, CT - last updated from the United States Federal Reserve on May of 2024.