The age distribution, , in Duillier is; 136 children or 13.0% of the population are between 0 and 9 years old and 145 teenagers or 13.9% are between 10 and 19. Of the adult population, 98 people or 9.4% of the population are between 20 and 29 years old. 170 people or 16.3% are between 30 and 39, 198 people or 19.0% are between 40 and 49, and 120 people or 11.5% are between 50 and 59. The senior population distribution is 97 people or 9.3% of the population are between 60 and 69 years old, 57 people or 5.5% are between 70 and 79, there are 21 people or 2.0% who are between 80 and 89, and there are 2 people or 0.2% who are 90 and older.