The age distribution, , in Hermetschwil-Staffeln is; 111 children or 10.0% of the population are between 0 and 9 years old and 180 teenagers or 16.2% are between 10 and 19. Of the adult population, 110 people or 9.9% of the population are between 20 and 29 years old. 153 people or 13.8% are between 30 and 39, 258 people or 23.3% are between 40 and 49, and 138 people or 12.4% are between 50 and 59. The senior population distribution is 83 people or 7.5% of the population are between 60 and 69 years old, 46 people or 4.1% are between 70 and 79, there are 28 people or 2.5% who are between 80 and 89,and there are 2 people or 0.2% who are 90 and older.