sentences:  Of the 27,551 households, 30.5% had children under the age of 18 living with them, 47.4% were married couples living together, 13.3% had a female householder with no husband present, 34.2% were non-families, and 28.5% of all households were made up of individuals.The average household size was 2.41 and the average family size was 2.93.The median age was 40.2 years.