The age distribution, , in Illgau is; 242 people or 33.6% of the population is between 0 and 19. 241 people or 33.4% are 20 to 39, and 166 people or 23.0% are 40 to 64.
The age distribution, in Illgau is; 242 people or 33.6% of the population are between 0 and 19 years old. 241 people or 33.4% are aged 20 to 39, and 166 people or 23.0% are aged 40 to 64.