Deliverance by James Dickey (in 2001, named as one of the 100 best English-language novels of the 20th century, as chosen by the editorial board of the Modern Library.)
... 18 to 24, 31.0% from 25 to 44, 21.9% from 45 to 64, and 16.9% who are 65 years of age or older. The median age is 39 years. For every 100 females there are 113.3 ...