The age distribution, , in Bretonnières is; 15 children or 7.4% of the population are between 0 and 9 years old and 25 teenagers or 12.3% are between 10 and 19. Of the adult population, 20 people or 9.8% of the population are between 20 and 29 years old. 22 people or 10.8% are between 30 and 39, 40 people or 19.6% are between 40 and 49, and 30 people or 14.7% are between 50 and 59. The senior population distribution is 28 people or 13.7% of the population are between 60 and 69 years old, 16 people or 7.8% are between 70 and 79, there are 8 people or 3.9% who are between 80 and 89.