The median age is 30 years. For every 100 females, there are 102.6 males. For every 100 females age 18 and over, there are 101.2 males. The median income for a household in the city is $36,944, and the median income for a family is $45,140. Males have a median income of $31,511 versus $26,403 for females. The per capita income for the city is $20,752. 15.3% of the population and 10.4% of families are below the poverty line. Out of the total population, 18.7% of those under the age of 18 and 8.5% of those 65 and older are living below the poverty line.. How many percent were not under the age of 18?