 The average household size was 2.91 and the average family size was 3.27.In the county, the population was spread out with 26.20% under the age of 18, 17.90% from 18 to 24, 36.30% from 25 to 44, 13.80% from 45 to 64, and 5.70% who were 65 years of age or older.The median age was 28 years.