 Persons under 18 years of age represented 21.5% of the population; 6.8% were aged from 18 to 24; 22.5%, from 25 to 44; 22.0%, from 45 to 64; and 27.3% of residents were 65 years of age or older.For every 100 females, there were 86.9 males; for every 100 females aged 18 and over, there were 81.7 males.The median income for a Fairbury household was $29,261; the median income for a family was $37,778.