 The average household size was 2.77 and the average family size was 3.19.The county population contained 28.90% under the age of 18, 8.30% from 18 to 24, 34.10% from 25 to 44, 21.60% from 45 to 64, and 7.10% who were 65 years of age or older.The median age was 34 years.