Generally, you must be 14 years old to work in Oregon. However, you may need to be older depending on the type of position for which you are applying and the set up of the business. See here for more information from the state website about employing minors: http://www.oregon.gov/BOLI/WHD/CLU/Pages/W_CLU_Taminors.aspx.
Quick Answer. According to Bio Kids, baby robins leave the nest about 2 weeks after hatching. After leaving the nest, which is called fledging, baby robins at first stay on the ground, close to their parents. The chicks are able to sustain flight about 2 weeks after fledging.
According to the Cornell Lab's Life History page on the American Robin, the time from hatching to fledging is an average of 13 days. The timing may vary a bit, depending on exactly which day hatching occurred, but it gives you an outside limit for how long the young will remain in the nest.