The age distribution, , in Bütschwil is; 482 children or 13.6% of the population are between 0 and 9 years old and 605 teenagers or 17.0% are between 10 and 19. Of the adult population, 411 people or 11.6% of the population are between 20 and 29 years old. 523 people or 14.7% are between 30 and 39, 454 people or 12.8% are between 40 and 49, and 341 people or 9.6% are between 50 and 59. The senior population distribution is 292 people or 8.2% of the population are between 60 and 69 years old, 245 people or 6.9% are between 70 and 79, there are 156 people or 4.4% who are between 80 and 89, and there are 41 people or 1.2% who are between 90 and 99.