sentences:  Of the 17,406 households, 35.2% had children under the age of 18 living with them, 57.2% were married couples living together, 9.9% had a female householder with no husband present, 28.1% were non-families, and 24.1% of all households were made up of individuals.The average household size was 2.66 and the average family size was 3.15.The median age was 38.4 years.