The age distribution, , in Bettwil is; 52 children or 9.3% of the population are between 0 and 9 years old and 84 teenagers or 15.0% are between 10 and 19. Of the adult population, 57 people or 10.2% of the population are between 20 and 29 years old. 71 people or 12.7% are between 30 and 39, 118 people or 21.0% are between 40 and 49, and 80 people or 14.3% are between 50 and 59. The senior population distribution is 51 people or 9.1% of the population are between 60 and 69 years old, 35 people or 6.2% are between 70 and 79, there are 9 people or 1.6% who are between 80 and 89,and there are 4 people or 0.7% who are 90 and older.