sentences:  Of the 11,598 households, 40.2% had children under the age of 18 living with them, 67.6% were married couples living together, 7.1% had a female householder with no husband present, 21.5% were non-families, and 18.4% of all households were made up of individuals.The average household size was 3.17 and the average family size was 3.66.The median age was 30.4 years.