 The average household size was 2.55 and the average family size was 3.03.The county population contained 20.30% under the age of 18, 29.40% from 18 to 24, 23.80% from 25 to 44, 17.40% from 45 to 64, and 9.00% who were 65 years of age or older.The median age was 25 years.