WORKING PERMITS: Every minor 14 through 17 years of age must have a working permit unless otherwise stated in Chapter 4109. Minors must be at least 14 years of age to obtain a work permit.Workers ages 16 to 17 have no restrictions on working hours when school is not in session. Yes, minors under 18 are required to have a work permit in Ohio, including 16-year-olds. 16yearolds are allowed to work up to 18 hours per week during a school week, with daily restrictions in place to protect their wellbeing. 16 - Basic minimum age for employment. Minors, ages 16 or 17, shall not be employed after p.m. On any night preceding a day school is in session. There is no official limit for the number of hours that a 16 or 17yearold can work each week when school is not in session in Ohio. Generally, youth who are 16 and 17 years old may work in a broad range of jobs, but cannot work in jobs that Ohio has deemed are too hazardous.