As of 2015, most states require their applicants to cosmetology school have a high school diploma or GED and be 16 years old to enroll. However, some states waive the graduation requirement but require applicants take a test to assess their basic literacy and math skills before they are admitted.
Some schools do not have an age requirement, but the state cosmetology board may place age restrictions. Some schools may waive these requirements for students who turn 16 or are to graduate high school before the end of the cosmetology certification program. Requirements may vary, so it is essential to check your state's or program's requirements before applying.