The age distribution, , in Hefenhofen is; 117 children or 10.1% of the population are between 0 and 9 years old and 202 teenagers or 17.5% are between 10 and 19. Of the adult population, 119 people or 10.3% of the population are between 20 and 29 years old. 121 people or 10.5% are between 30 and 39, 225 people or 19.5% are between 40 and 49, and 180 people or 15.6% are between 50 and 59. The senior population distribution is 81 people or 7.0% of the population are between 60 and 69 years old, 69 people or 6.0% are between 70 and 79, there are 34 people or 2.9% who are between 80 and 89, and there are 6 people or 0.5% who are 90 and older.