The age distribution, , in Grandevent is; 22 children or 10.8% of the population are between 0 and 9 years old and 29 teenagers or 14.3% are between 10 and 19. Of the adult population, 15 people or 7.4% of the population are between 20 and 29 years old. 29 people or 14.3% are between 30 and 39, 39 people or 19.2% are between 40 and 49, and 29 people or 14.3% are between 50 and 59. The senior population distribution is 23 people or 11.3% of the population are between 60 and 69 years old, 13 people or 6.4% are between 70 and 79, there are 4 people or 2.0% who are between 80 and 89.