In the 2000 Census, Oklahoma City's age composition was 25.5% under the age of 18, 10.7% from 18 to 24, 30.8% from 25 to 44, 21.5% from 45 to 64, and 11.5% who were 65 years of age or older.
Oklahoma City is the principal city of the eight-county Oklahoma City Metropolitan Statistical Area in Central Oklahoma and is the state's largest urbanized area.