The age distribution, , in Sementina is; 329 children or 10.8% of the population are between 0 and 9 years old and 292 teenagers or 9.6% are between 10 and 19. Of the adult population, 326 people or 10.7% of the population are between 20 and 29 years old. 487 people or 16.0% are between 30 and 39, 512 people or 16.8% are between 40 and 49, and 348 people or 11.4% are between 50 and 59. The senior population distribution is 397 people or 13.1% of the population are between 60 and 69 years old, 215 people or 7.1% are between 70 and 79, there are 135 people or 4.4% who are over 80.