The age distribution, , in Caslano is; 389 children or 9.7% of the population are between 0 and 9 years old and 486 teenagers or 12.2% are between 10 and 19. Of the adult population, 362 people or 9.1% of the population are between 20 and 29 years old. 506 people or 12.7% are between 30 and 39, 657 people or 16.4% are between 40 and 49, and 521 people or 13.0% are between 50 and 59. The senior population distribution is 497 people or 12.4% of the population are between 60 and 69 years old, 381 people or 9.5% are between 70 and 79, there are 197 people or 4.9% who are over 80.