 26.4% of residents were under the age of 18; 8% were between the ages of 18 and 24; 24.8% were from 25 to 44; 25.4% were from 45 to 64; and 15.3% were 65 years of age or older.The gender makeup of the city was 49.5% male and 50.5% female.As of the census of 2000, there were 20,971 people, 8,302 households, and 5,562 families residing in the city.