The age distribution, , in Gretzenbach is; 228 children or 9.5% of the population are between 0 and 6 years old and 465 teenagers or 19.4% are between 7 and 19. Of the adult population, 115 people or 4.8% of the population are between 20 and 24 years old. 785 people or 32.8% are between 25 and 44, and 541 people or 22.6% are between 45 and 64. The senior population distribution is 198 people or 8.3% of the population are between 65 and 79 years old and there are 61 people or 2.5% who are over 80.