The age distribution, , in Arnex-sur-Nyon is; 15 children or 12.1% of the population are between 0 and 9 years old and 13 teenagers or 10.5% are between 10 and 19. Of the adult population, 12 people or 9.7% of the population are between 20 and 29 years old. 19 people or 15.3% are between 30 and 39, 22 people or 17.7% are between 40 and 49, and 19 people or 15.3% are between 50 and 59. The senior population distribution is 16 people or 12.9% of the population are between 60 and 69 years old, 7 people or 5.6% are between 70 and 79, there is 1 person who is 80 and 89.