Some people in the world say that cultivating immortals can become immortals, and efforts can become immortals; It is also said that the first-class life expectancy 120 years old, both ancient and modern. After this age of 120, there is no one who is not ridiculous. Neither of the above statements is reasonable. Please let me make a general argument. Even if the immortal can't actually see with his eyes, so many documentary books are recorded and the previous historical materials are written down. It can be said that the existence of immortals is certain. Probably it is to accept the magical "qi" between heaven and earth and get talent from nature, which is very special and can not be achieved through the accumulation of learning. As for proper conditioning, so as to obtain the ultimate life of nature, it is possible to live to 1000 years old, or at least several hundred years old. But in fact, people all over the world are not proficient in this kind of aftercare, so they don't live long.