The age distribution, , in Billens-Hennens is; 77 children or 12.4% of the population are between 0 and 9 years old and 78 teenagers or 12.6% are between 10 and 19. Of the adult population, 62 people or 10.0% of the population are between 20 and 29 years old. 89 people or 14.3% are between 30 and 39, 83 people or 13.4% are between 40 and 49, and 56 people or 9.0% are between 50 and 59. The senior population distribution is 49 people or 7.9% of the population are between 60 and 69 years old, 56 people or 9.0% are between 70 and 79, there are 58 people or 9.3% who are between 80 and 89, and there are 13 people or 2.1% who are 90 and older.