The age distribution, , in Häfelfingen is; 14 children or 5.2% of the population are between 0 and 6 years old and 55 teenagers or 20.4% are between 7 and 19. Of the adult population, 28 people or 10.4% of the population are between 20 and 29 years old. 21 people or 7.8% are between 30 and 39, 66 people or 24.4% are between 40 and 49, and 42 people or 15.6% are between 50 and 64. The senior population distribution is 32 people or 11.9% of the population are between 65 and 79 years old and there are 12 people or 4.4% who are over 80.