Some cases, it is true. The kids are older. I have no problem with kids once they get 15ish to start working. Many kids are physically mature by then. However, a 13 year old, whose bone structure hasn't filled out, is going to be severely physically disabled when they get older, by repetitive motion injuries, that were accentuated by their body growing in the shape of their injuries.
I am sure Kathy Lee went to Guatamala though to ensure that her 13 year old darlings were following ergonomic safety procedures though.
Those "ergonomic safety procedures" are one of the reasons the stuff is manufactured in Guatamala. So many of these "feel good" regulations are issued by gov't workers trying to justify their jobs that American companies can't afford to do things here in the USA.