 28.2% of residents were under the age of 18; 8.7% were between the ages of 18 and 24; 28.2% were from 25 to 44; 24.3% were from 45 to 64; and 10.8% were 65 years of age or older.The gender makeup of the city was 48.4% male and 51.6% female.As of the census of 2000, there were 21,730 people, 7,945 households, and 5,807 families living in the city.