The median age in Johnson Township, Minnesota is 32.5, as per 2021 ACS 5-Year Estimates. Of the total population, 12.07% were under the age of 15, 36.21% aged 15 to 29, 39.66% aged 30 to 64, 12.07% aged 65 to 84, and 0.00% were 85 years of age and older.