 The average household size was 3.10 and the average family size was 3.52.The county population contained 34.90% under the age of 18, 9.70% from 18 to 24, 25.30% from 25 to 44, 19.70% from 45 to 64, and 10.30% who were 65 years of age or older.The median age was 30 years.