In Irwindale the population was spread out with 33.4% under the age of 18, 10.0% from 18 to 24, 32.0% from 25 to 44, 16.5% from 45 to 64, and 8.1% who were 65 years of age or older.
В городе проживает 33,4% населения в возрасте до 18 лет, 10,0% от 18 до 24 лет, 32,0% от 25 до 44 лет, 16,5% от 45 до 64 лет, и 8,1% в возрасте 65 лет и старше.