In the county, the population was spread out with 24.90% under the age of 18, 7.20% from 18 to 24, 28.10% from 25 to 44, 23.60% from 45 to 64, and 16.30% who were 65 years of age or older.  The median age was 39 years. For every 100 females there were 97.10 males.  For every 100 females age 18 and over, there were 93.60 males.. How many percent of the county population were not under the age of 18?