The length of a person's life is a very complicated situation. Many people think that being in a good mood will lead to longevity, but being in a good mood is only one aspect of longevity, and genes, diet, exercise and living habits also play an important role. Keeping a good mood is easier said than done. Some people like ruthlessness, while others have secular desires. How can they be heartless? Most people can't be heartless, but they all have hearts and lungs. Being happy doesn't mean being in a good mood, which is not good for your health. Don't deliberately pursue longevity, a person has a life limit, and a person has life. We can pursue a positive attitude towards life and a way of keeping in good health at ordinary times, but we can only do it, do our best and leave it to fate. A real good mood is a real disregard for life and death. It's all a matter of time. Why live more than ten or eight years and less than ten or eight years? Thousands of years, tens of thousands of years, who knows who has lived for more than 20 years and who has lived less than 20 years?