People, when they become adults, will gradually age as the years go by until they die. From birth to death, people will get sick, and some will even die from illness. Some people, who have been in good health all their lives, finally die at an advanced age, sitting in a chair, talking to others, without any pain, which is the healthy end of life, called “the end of life”. Therefore, there are two kinds of death, one is “death from disease” and the other is “death at the end of life”, a healthy death. So, what is the difference between aging and disease? Aging is a normal evolutionary process of life. We can compare life to a freight car. Suppose, at first, the car can carry ten tons of weight, and when it is loaded with goods every day, the car will experience chronic wear and tear, and its capacity will become smaller and smaller, which is equivalent to the aging process of life; however, as long as the weight of the goods you load does not exceed its capacity, it can still be driven and can still carry goods. When the maximum load of the car has aged and reduced to 6 tons, if you put 8 tons of cargo on it, it will be crushed. This is the equivalent of “disease”. Within the load range of the car, you do not “destructively use” it every day, it can run normally every day. Until one day, it completely aging, come to an end, no longer able to bear any weight of goods, it will be the end of life, scrapped, dead. Life can also be compared to the “monkey tendon”. Initially, the monkey skin tendon can be pulled out six times the length; with the aging of the monkey skin tendon oxidation, the maximum length of the monkey skin tendon can be pulled out will gradually decline, until finally, even if not stretch it, it will break itself. In the aging (aging) process, if you go beyond its elastic range and stretch it excessively, it will cause the monkey skin band to break, which is equivalent to a “disease”. When people are young, they can jump from a meter high place, not to fracture; after old age, if you jump from a meter high place, it may cause fracture, which is called “disease”. Even when you are young, if you jump from a height of eight meters, you can still fall and break a bone. Illness is any blow that causes damage to physical or mental functions beyond the scope of life (compensatory capacity or ability to bear). A young person in good health can run as hard as he can, and his heart rate can reach 160 beats per minute, and he can run until he can’t run anymore without having a heart attack. In the process of aging, the arterial walls of the heart become thicker and the lumen narrower, resulting in insufficient blood supply to the heart. If elderly people exercise as vigorously as young people, they will develop “coronary heart disease” angina, or even myocardial infarction and sudden death. The elderly in the normal aging process, if the amount of exercise done, not more than the load allowed by the heart, you can not heart disease, you can go to the final “end of life”, a healthy death. Therefore, health is the use of life within the range of life tolerance or compensation, and the function of life occurs; disease is beyond the range of life or compensation, to “destructive use” of life, resulting in damage to life, until the end of life (death due to disease). Aging is the gradual narrowing of the range of life tolerance or compensation over time; if life is not used beyond the range of life tolerance or compensation, life can continue to “end of life” (healthy death). Once we understand the concept of aging and disease, we also need to know how far we are able to live or compensate for life. The conclusion reached by the aliens observing the earthlings is that the earthlings, are busy turning all kinds of resources into garbage. Imagine an alien doctor looking at earthlings and the basic conclusion reached is that earthlings, by all means, are destroying the original health of life. When an alien psychotherapist or counselor looks at Earthlings, the basic conclusion is that Earthlings, through various means, are putting themselves under more and more psychological pressure and destroying their own original psychological health. Conclusion: Cherish life and health! In our natural growth and aging process, life can be brought to an “end of life” and eventually to a healthy death as long as we do not “use” it in a destructive way.