The median age in Beaver township, Aitkin County, Minnesota is 74.4, as per 2021 ACS 5-Year Estimates. Of the total population, 5.56% were under the age of 15, 0.00% aged 15 to 29, 5.56% aged 30 to 64, 83.33% aged 65 to 84, and 5.56% were 85 years of age and older.