 The average household size was 2.87 and the average family size was 3.43.In the county, the population was spread out with 31.80% under the age of 18, 8.10% from 18 to 24, 33.80% from 25 to 44, 18.90% from 45 to 64, and 7.50% who were 65 years of age or older.The median age was 31 years.