The median age in Barnett Township, Minnesota is 38.5, as per 2021 ACS 5-Year Estimates. Of the total population, 11.24% were under the age of 15, 24.16% aged 15 to 29, 50.00% aged 30 to 64, 5.62% aged 65 to 84, and 8.99% were 85 years of age and older.