The age distribution, , in Gilly is; 121 children or 13.0% of the population are between 0 and 9 years old and 139 teenagers or 14.9% are between 10 and 19. Of the adult population, 62 people or 6.6% of the population are between 20 and 29 years old. 133 people or 14.2% are between 30 and 39, 183 people or 19.6% are between 40 and 49, and 126 people or 13.5% are between 50 and 59. The senior population distribution is 77 people or 8.2% of the population are between 60 and 69 years old, 58 people or 6.2% are between 70 and 79, there are 30 people or 3.2% who are between 80 and 89, and there are 5 people or 0.5% who are 90 and older.