The age distribution, , in Sévaz is; 19 children or 13.1% of the population are between 0 and 9 years old and 14 teenagers or 9.7% are between 10 and 19. Of the adult population, 23 people or 15.9% of the population are between 20 and 29 years old. 29 people or 20.0% are between 30 and 39, 26 people or 17.9% are between 40 and 49, and 11 people or 7.6% are between 50 and 59. The senior population distribution is 15 people or 10.3% of the population are between 60 and 69 years old, 7 people or 4.8% are between 70 and 79, there is 1 person who is 80 and 89.