sentences:  Of the 51,927 households, 31.3% had children under the age of 18 living with them, 47.4% were married couples living together, 13.6% had a female householder with no husband present, 33.9% were non-families, and 28.3% 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 39.2 years.