The median age in Spring Brook Township, Minnesota is 37.0, as per 2021 ACS 5-Year Estimates. Of the total population, 27.27% were under the age of 15, 13.64% aged 15 to 29, 18.18% aged 30 to 64, 40.91% aged 65 to 84, and 0.00% were 85 years of age and older.