The age distribution, , in Liedertswil is; 9 children or 5.6% of the population are between 0 and 6 years old and 23 teenagers or 14.2% are between 7 and 19. Of the adult population, 11 people or 6.8% of the population are between 20 and 29 years old. 20 people or 12.3% are between 30 and 39, 31 people or 19.1% are between 40 and 49, and 38 people or 23.5% are between 50 and 64. The senior population distribution is 24 people or 14.8% of the population are between 65 and 79 years old and there are 6 people or 3.7% who are over 80.