I got a job at 15 (which was when I was legally allowed to). All through high school, I could never manage a job past about November - that was when school always started hitting really hard with exams and projects, and I was on an all-honors/AP track. So I would quit in November and get another job in May. The thing is, those restrictions exist, but a lot of employers ignore them, and are you as a 15-year-old going to risk getting fired to stand up to your boss? I wasn't.