 22.4% of residents were under the age of 18; 8.4% were between the ages of 18 and 24; 28.1% were from 25 to 44; 28.3% were from 45 to 64; and 12.8% were 65 years of age or older.The gender makeup of the city was 50.3% male and 49.7% female.As of the census of 2000, there were 31,881 people, 13,399 households, and 8,066 families residing in the city.