Memes

A lot more children from developing countries tend to want to be teachers because education is not taken for granted there (even when it has been universally available for a couple generations like it is now in China, the times in which it was not are still in living memory...go back to the 1960s and 70s and you still had many people in especially rural China who had very low levels of education). Education is seen there as a noble profession helping people on the path to a better life, and they look at teachers not too differently from how they look at doctors.

By contrast, developed countries tend to take education for granted, and young people see that education is not really that necessary to become rich, powerful and famous, and the most glamorized people in the society tend to be either some kind of entertainer, sports or pop star, or rich entrepreneurs.