In the village the population was spread out with 24.4% under the age of 18, 10.4% from 18 to 24, 35.7% from 25 to 44, 18.4% from 45 to 64, and 11.1% who were 65 years of age or older.
Возрастной состав населения Роузмонта: 24,4 % лица в возрасте до 18 лет, 10,4 % от 18 до 24 лет, 35,7 % от 25 до 44 лет, 18,4 % от 45 до 64 лет и 11,1 % от 65 лет и старше.