 The average household size was 2.81 and the average family size was 3.27.In the county, the population was spread out with 28.60% under the age of 18, 10.30% from 18 to 24, 34.00% from 25 to 44, 19.40% from 45 to 64, and 7.80% who were 65 years of age or older.The median age was 31 years.