 This represents a population growth rate of 0.4%.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.