sentences:  Of the 16,148 households, 30.9% had children under the age of 18 living with them, 48.9% were married couples living together, 12.8% had a female householder with no husband present, 33.5% were non-families, and 28.8% of all households were made up of individuals.The average household size was 2.40 and the average family size was 2.91.The median age was 41.4 years.