 The age distribution, , in Rivera is; 146 children or 9.2% of the population are between 0 and 9 years old and 153 teenagers or 9.6% are between 10 and 19.Of the adult population, 217 people or 13.6% of the population are between 20 and 29 years old.227 people or 14.2% are between 30 and 39, 286 people or 17.9% are between 40 and 49, and 231 people or 14.5% are between 50 and 59.