The 80-year-old man has experienced all kinds of hardships. On the one hand, they have good physical exercise and good psychological quality when they are young. On the other hand, if you think about people's environment at that time, the air was fresh and there was no pollution. Although they ate coarse grains, they were at ease and naturally happy. In the current environment, keeping fit is better than nourishing the heart, doing things calmly, having a good attitude and exercising more, which is better than anything else. Don't believe any health programs, it's all bullshit. As long as you are strong and physically and mentally healthy, disasters and serious illnesses will naturally stay away from you. Besides, people don't necessarily maintain it. Some old people smoke all their lives and live to be over 90 years old.