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.
The age distribution in Beinwil shows that 8.0% of the population is under 6 years old, with 19.6% falling between 7 and 19 years old.  In the adult population, 6.1% are aged 20 to 24.