The age distribution, , in Beinwil is: 25 children or 8.0% of the population are between 0 and 6 years old and 61 teenagers or 19.6% are between 7 and 19. Of the adult population, 19 people or 6.1% of the population are between 20 and 24 years old. 86 people or 27.7% are between 25 and 44, and 87 people or 28.0% are between 45 and 64. The senior population distribution is 24 people or 7.7% of the population are between 65 and 79 years old and there are 9 people or 2.9% who are over 80.