sentences:  Of the 5,503 households, 31.1% had children under the age of 18 living with them, 57.3% were married couples living together, 8.7% had a female householder with no husband present, 28.3% were non-families, and 23.8% of all households were made up of individuals.The average household size was 2.56 and the average family size was 3.00.The median age was 42.4 years.