 There were 13,128 families (75.1% of all households); the average family size was 3.49.The population was spread out, with 16,731 people (31.0%) under the age of 18, 5,478 people (10.2%) aged 18 to 24, 14,764 people (27.4%) aged 25 to 44, 11,647 people (21.6%) aged 45 to 64, and 5,347 people (9.9%) who were 65 years of age or older.The median age was 30.9 years.