sentences:  Of the 6,726 households, 28.9% had children under the age of 18 living with them, 51.7% were married couples living together, 9.6% had a female householder with no husband present, 34.0% were non-families, and 29.3% of all households were made up of individuals.The average household size was 2.36 and the average family size was 2.88.The median age was 42.1 years.