 The age distribution, , in Oberwil is; 705 children or 6.8% of the population are between 0 and 6 years old and 1,409 teenagers or 13.5% are between 7 and 19.Of the adult population, 966 people or 9.3% of the population are between 20 and 29 years old.1,294 people or 12.4% are between 30 and 39, 1,849 people or 17.7% are between 40 and 49, and 2,130 people or 20.4% are between 50 and 64.