Answer based on context:

There were 412 households of which 33.7% had children under the age of 18 living with them, 54.6% were married couples living together, 10.4% had a female householder with no husband present, 6.1% had a male householder with no wife present, and 28.9% were non-families. 25.7% of all households were made up of individuals and 12.6% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 3.02.The median age in the village was 40.9 years. 26% of residents were under the age of 18; 8.3% were between the ages of 18 and 24; 21.4% were from 25 to 44; 28.7% were from 45 to 64; and 15.6% were 65 years of age or older. The gender makeup of the village was 48.9% male and 51.1% female.

Which age group is smaller: under the age of 18 or 18 and 24?
18 and 24