 The average household size was 2.36 and the average family size was 2.89.The county population contained 19.90% under the age of 18, 9.80% from 18 to 24, 38.30% from 25 to 44, 25.00% from 45 to 64, and 6.90% who were 65 years of age or older.The median age was 35 years.