I know Asians tend to look younger, but at 0:36 in the video, it totally looked like at least one underage worker and the cameraman quickly moved the camera away.
Shenzhen China... probably literally next door to where the real ones are made.
Damn, that machine at the end pressing parts wouldn't cut it in all the factories I've worked at. It only requires one hand to cycle, which makes it too easy to get your hand caught in the machine. In all the places I've worked at I've had to use both hands on 2 separate buttons to cycle the machine, making it impossible to get your hand stuck. Something tells me this is the norm in China.
I notice some of the workers in the noisy factory were not wearing ear defenders?