The age distribution, , in Avenches is; 349 children or 11.4% of the population are between 0 and 9 years old and 376 teenagers or 12.3% are between 10 and 19. Of the adult population, 404 people or 13.2% of the population are between 20 and 29 years old. 426 people or 13.9% are between 30 and 39, 508 people or 16.6% are between 40 and 49, and 375 people or 12.3% are between 50 and 59. The senior population distribution is 301 people or 9.8% of the population are between 60 and 69 years old, 198 people or 6.5% are between 70 and 79,there are 101 people or 3.3% who are 80 and 89, and there are 22 people or 0.7% who are 90 and older.