context: In 2000 there were 128,925 households in Toledo, out of which 29.8% had children under the age of 18 living with them, 38.2% were married couples living together, 17.2% had a female householder with no husband present, and 40.0% were non-families. 32.8% of all households were made up of individuals and 11.0% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 3.04.
question: which household was least common?
answer: 65 years of age