Youth Employment ← Knowledge Base At what age can a young person start working? What jobs are not allowable for 14- and 15-year-olds? If a young person works for a parent, does the law still apply? Are Work Certificates required for employment? Are there two different Work Certificates? Does the superintendent of the public school need to sign off on the work certificate even if the youth is a private or home-schooled student? What if the superintendent does not sign the work certificate because he or she is not familiar with the student? Can a person under the age of 18 be an independent contractor? What if Missouri and federal child labor laws do not agree?