Almost all minors under the age of 18 are subject to California's child labor protections. Thus, the only savings on overtime hours that can apply are those for16 and 17 year olds, who are allowed to work up to 48 hours per week.For most employers, a minor must be at least 14 years of age to work. In California, most minors under the age of 18 must have a permit to work. California's minimum legal age to work is generally 14 years old. 16 and 17yearolds are allowed to work between 5 a.m. Minors between the ages of 14 and 17 must have completed seventh grade to work while school is in session. I worked at Bel Air for a year and a half, we always had 16 and 17 year old courtesy clerks. C.49141) must have a Work Permit except if minor has graduated from high school. However, this law is only applicable to teenagers under 18 years and who have not yet graduated from high school.