These statements have no scientific basis and are speculations of the old times. Therefore, it is also considered to be superstitious and unreliable. However, in the old days, people set up many obstacles on people's age in this way, which is also a reminder of people's health, life safety and communication with people.
369 is the origin of the pass.
As the saying goes, people believe that when a person reaches a certain age, that is, the so-called critical age, there is not only one age, but also many.
According to the popular saying, going through these years is like going through a dangerous pass, encountering all kinds of difficulties and disasters, and even falling into the abyss because of a little accident. On the road of life, it is doomed not to be smooth sailing. After a pass, there will be a new pass waiting for you.
The rural proverb "369 is the gateway, and December is the gateway for children" divides people's two ages into stages, namely childhood and adulthood. The previous sentence, in many folk explanations, seems far-fetched, with the brand of backwardness and ignorance in the farming era, that is, strong superstition.
The last sentence, whether in the past or now, children's physical health and personal safety are the things that parents are most concerned about, which makes sense from the perspective of loving and protecting children.