The median age in Stony Brook Township, Minnesota is 50.4, as per 2021 ACS 5-Year Estimates. Of the total population, 12.58% were under the age of 15, 15.89% aged 15 to 29, 58.94% aged 30 to 64, 12.58% aged 65 to 84, and 0.00% were 85 years of age and older.