 23.8% of residents were under the age of 18; 14.1% were between the ages of 18 and 24; 26.4% were from 25 to 44; 23.9% were from 45 to 64; and 11.7% were 65 years of age or older.The gender makeup of the city was 47.9% male and 52.1% female.As of the census of 2000, there were 20,559 people, 7,724 households, and 5,020 families living in the city.