In the town, 10.0% of the population were under the age of 18, 55.7% were from 18 to 24, 13.3% were from 25 to 44, 13.6% were from 45 to 64, and 7.4% were 65 years of age or older. The median age was 21.6 years. For every 100 females, there were 95.8 males. For every 100 females age 18 and over, there were 94.7 males.. Which age group had the least people?