Evidence of age and the written permission of parents Employers must see a copy of the young person's birth certificate, or other evidence of his or her age, before Teen workers rights that person. Employers with employees under 18 must also display the official summary of the Teen workers rights at a place in their workplace where it can be easily read. If a young person under 18 Teen workers rights for more than one employer, the combined daily or weekly hours of work cannot exceed the maximum number of hours allowed. If you are covered by a union contractyou might have additional protections. The maximum working week for young people aged 16 and 17 is 40 hours, with a maximum of 8 hours a day. The California Department of Industrial Relations DIR also has a website that outlines your rights on the job and how to stay safe in several common jobs for teens food service, grocery clerk, etc.