 20.6% of residents were under the age of 18; 8.3% were between the ages of 18 and 24; 24.4% were from 25 to 44; 31.3% were from 45 to 64; and 15.4% were 65 years of age or older.The gender makeup of the city was 49.3% male and 50.7% female.As of the census of 2000, there were 20,255 people, 8,055 households, and 5,557 families residing in the city.