Why do those middle-aged men like to shave their heads in labor camps?

First of all, the bald head you mentioned is called bald head, because it is easy to clean and maintain hygiene, it is not easy to produce odor, and it can also reduce the problem of hair loss. Therefore, reform-through-labor personnel need to shave their heads, but that is not exclusive to reform-through-labor

Some middle-aged men like to shave their heads for convenience. You can wash your hair with some water when you wash your face. Anyway, there is no "hair". In winter, you may feel cold because you have no hair, but with the increase of weather temperature, shaving your head will reduce the sultry heat caused by hair coverage and make people feel very cool.

When people are young, they will pay great attention to the outside world. In order to attract some people, they will pay special attention to their appearance. When people go through some major changes, their mentality will change, and some things that they used to pay attention to will become things that they don't have to care about when they get old.