Chinese 12 year old girls can look 7 or 8 y.o. to an American who doesn’t know a lot of Chinese people. That is less and less so as nutrition levels rise but is still true in much of the countryside.
on the vieo they say young girls and boys...14 years old.
https://www.youtube.com/watch?v=PfWgEQj6Dfc&feature=youtu.be
around 45 minute mark
young girls and some young boys