The age distribution, , in Grellingen is; 105 children or 6.1% of the population are between 0 and 6 years old and 255 teenagers or 14.7% are between 7 and 19. Of the adult population, 197 people or 11.4% of the population are between 20 and 29 years old. 225 people or 13.0% are between 30 and 39, 316 people or 18.3% are between 40 and 49, and 397 people or 22.9% are between 50 and 64. The senior population distribution is 174 people or 10.1% of the population are between 65 and 79 years old and there are 62 people or 3.6% who are over 80.