In fact, the legend of Peng Zu is exaggerated in our opinion, because the average life expectancy of ancient people is very low, basically it will be a long life after forty or fifty years, and people feel incredible when they see that Peng Zu can live to be over 800 years old, because in modern society, the oldest old man is also a hundred years old and basically died, so the legend of Peng Zu is more a rumor of the ancients, because living to be over 800 years old is actually a rumor of the ancients.
In order to pursue immortality, many emperors in ancient feudal dynasties always cultivated elixirs at the expense of people and money, but basically they poisoned themselves in the end. These powerful emperors failed to get the secret of immortality. Why can Peng Zu? According to my understanding, even though Peng Zu is a monk, the Taoist method basically pays more attention to keeping in good health, so this method may be useful for prolonging life, but at most it is only 100 years old, so it seems to me that Peng Zu can live to be over 800 years old.
Anyone who knows ancient times knows that the life expectancy of the ancients is generally very low, and many of them can't live beyond 30 years old. Because of lack of food and clothing and backward medical level, a simple cold may kill him. Therefore, Peng Zu's 800-year-old life is more exaggerated from later generations, which is not true at all.