 This represents a population growth rate of 4.0%.The age distribution, , in Gravesano is; 128 children or 10.7% of the population are between 0 and 9 years old and 120 teenagers or 10.1% are between 10 and 19.Of the adult population, 116 people or 9.7% of the population are between 20 and 29 years old.