Why are some people young and old?

Local customs are different, so generations are different.

First of all, as we all know, China is a country of etiquette, and there have been various clan etiquette since ancient times, among which the ancients paid the most attention to seniority. Three wives and four concubines were normal in ancient times, and the national strength was calculated according to the population. So there is no such thing as family planning, but people are proud of having many children and grandchildren. In ancient times, people got married earlier. The result is often that the younger son gets married soon after he is born. As a result, the age difference between the eldest son and the youngest brother is much different. That is to say, although the eldest son's child may be about the same age as his younger brother, the other half about his age should be called uncle. After several generations, the seniority became worse and worse, and Xiao Ni in the village appeared. Secondly, the generation within the same clan is calculated according to whether it belongs to the same family, and whether it belongs to the same family depends on whether it is still within the five clothes. In ancient times, there was a saying that Nagato's grandson was the grandfather of the last school. Nagato refers to the descendants handed down by the eldest son, while the last door naturally refers to the descendants handed down by the younger son. Generally speaking, the life span of most people will not exceed 100 years. Therefore, the relationship between Nagato's descendants and the descendants of the last family is used to judge whether they are in the five clothes. Generally speaking, those who are so low in seniority outside the Five Dynasties are given five battles. It can be seen that the reason why this little boy is called "Ye's younger generation" is mainly because people in the past did not control fertility and got married early, which led to the emergence of many old sons, which led to the situation that the eldest son's son might be similar to his younger brother.