I think it depends on the state and if it’s certain businesses like a family owned business or certain exceptions. I was delivering papers and mowing laws at 12 but that was in the 90s and it wasn’t to support me it was just on the weekends to have some money for video games, going to the movies, buy junk food, etc. I didn’t get a normal wage job until I was 16 working after school and weekends, and didn’t get a job that actually paid enough to support myself (with a roommate) until 19/20.