What is history: it is the echo of the past to the future, the reflection of the future on the past. - Hugo
In addition to the death of the Qin Dynasty and the Sui Dynasty, other dynasties have many emperors, some of whom have achieved a very good reputation because they have worked hard to govern and develop the country very well, and some emperors have left their names because they are faint and incompetent, pushing the country into the abyss of destruction.

But whether they have merit or have done so, they all have a common characteristic, that is, most of them are not more than forty years old, and it is reasonable to say that the emperor's life is so superior, whether it is food, clothing or housing, it can be regarded as the top in the ancient world.
Why did it so hard for ancient emperors to live past 40 years? There are 5 fatal causes!
Stressful
Although the emperor's life is relatively superior, but the emperor also has a lot of pressure, this is one of the reasons for the emperor's short average life expectancy, the emperor is the monarch of a country, usually need to go to the dynasty to deal with things, large and small things need the emperor to personally deal with, so in ordinary life, the emperor's emotions have always needed to maintain a tense state.
As the ruler of a country, he should consider not only his own life, but also the life of the people of Li, and at the same time pay attention to the frontier issues, prevent foreign aggression, and prevent the corruption and rebellion of his ministers.
rebellion
The second reason is that after many years of a dynasty, the people of Li will have some dissatisfaction under the incompetent leadership of the emperor, and under this sentiment, when the number is large, it is inevitable that there will be thoughts of rebellion, so there will be rebellion. When these rebellious armies hit the imperial city and overthrow the rule, the most obvious sign of success is to kill the emperor who was in power of the dynasty, so there are many emperors who were killed at a young age because of war, according to relevant statistics, nearly half of the emperors in ancient China died because of this.
A lot of things
Another reason is that when the emperor's task is more arduous, the emperor's early dynasty is a must, the ministers will present the emperor in the early dynasty, but also listen to the opinions of the ministers, but also think and solve problems. After the end of the early dynasty, the emperor also had to review these recitals, which was not a simple matter, and after the emperor had read these documents, he also had to think about some solutions, and at the same time as reading the recitals, he would also have to meet with the ministers if they asked for a meeting.
It can be said that the emperor was the busiest person in terms of official duties in ancient times, and some responsible emperors would often approve the recital until the middle of the night, which greatly reduced the emperor's rest time, and the time was accumulated.
High losses
Another reason is because the emperor's jingyuan is losing more quickly. We all know that the emperor's harem has a large number of concubines, and many men want to be emperor because of the harem's three thousand beautiful women.
But it is also so many concubines that the emperor's life expectancy is greatly shortened, we have seen the court drama know that the emperor will have concubines to serve every night, and the emperor in order to be able to have a prince to help him work and pass on the generations, so in this matter is also relatively hard, the body will not be able to eat after a long time. At the same time, there are also many emperors in history who completely abandoned the government because they were addicted to the beauty of the harem, and over time, they caused the dissatisfaction of many people and died of the second reason.
heredity
The last reason is the problem of heredity. In ancient China, there was no law that close relatives could not marry, so the emperor looked at which young relative looked better, or for his royal blood to be more pure, he would include her in his harem, after a period of time, he gave birth to a man and a half woman, and finally the son inherited his throne, but because it was a close relative who married, many diseases would be inherited, so the emperor's life expectancy was slowly shortened.
This is also the five important reasons why the general life expectancy of ancient emperors is relatively short, and perhaps this is why ancient emperors were so keen to obtain the elixir of immortality.