 27.8% of all households were made up of individuals, and 10.4% consisted of a person 65 years of age or older living alone.The average household size was 2.31 and the average family size was 2.81.Preston Townships's age distribution was 19.7% under the age of 18, 2.8% between the ages of 18 and 24, 22.7% between 25 and 44, 35.3% between 45 and 64, and 19.5% 65 years of age or older.