The age distribution, , in Selzach is; 210 children or 7.5% of the population are between 0 and 6 years old and 444 teenagers or 15.8% are between 7 and 19. Of the adult population, 143 people or 5.1% of the population are between 20 and 24 years old. 793 people or 28.2% are between 25 and 44, and 767 people or 27.3% are between 45 and 64. The senior population distribution is 361 people or 12.8% of the population are between 65 and 79 years old and there are 92 people or 3.3% who are over 80.