The age distribution, , in Crassier is; 168 children or 16.4% of the population are between 0 and 9 years old and 144 teenagers or 14.0% are between 10 and 19. Of the adult population, 70 people or 6.8% of the population are between 20 and 29 years old. 163 people or 15.9% are between 30 and 39, 203 people or 19.8% are between 40 and 49, and 106 people or 10.3% are between 50 and 59. The senior population distribution is 114 people or 11.1% of the population are between 60 and 69 years old, 45 people or 4.4% are between 70 and 79, there are 11 people or 1.1% who are between 80 and 89, and there are 3 people or 0.3% who are 90 and older.