From ancient times to the present, being able to "rejuvenate one's youth" has always been a dream of people, especially the elderly. "The old lady in her 70s is pregnant", "the old lady in her 90s is menstruating again", in recent years, such things have come into people's attention from time to time across the country. Recently, there were media reports that a 68-year-old man from Sichuan actually had new black hair and acne, and his skin was noticeably smoother than before. So, are these so-called "rejuvenation" phenomena just our wishful thinking, or are they real? Local media reported that Mr. Zhu’s hair turned completely white when he was in his early 40s, and it has been 28 years now. But at the end of June this year, when Mr. Zhu went to the barber shop for a haircut, the barber actually told him that black hair had grown on his head, and the black hair has continued to grow until now. After learning that his hair was "rejuvenated", the old man paid more attention to the "strange phenomena" that had happened to him before. Old Man Zhu said that in the past, his skin was very rough, but in the past four or five years, others have discovered that his skin is not consistent with his age and is extremely smooth. What’s even more strange is that pimples actually appeared on Old Man Zhu’s face. This “mark” that only appears when a teenager’s body grows and develops, now appears on Old Man Zhu’s face. As a result, his family members say that Old Man Zhu has “returned to youth”. . A 75-year-old woman in Beijing, her white hair turned black and she grew new teeth. At the same time, the reporter heard that there is also a famous old lady on Xueyuan Road in Beijing who is "rejuvenated". After many twists and turns, reporters found Li Guihua, who is 75 years old this year. When I first met Li Guihua, she was wearing a dark green cheongsam with black hair. She looked very young compared to her age. Li Guihua told reporters that she was originally a university teacher. Within two years of her retirement, her hair turned white. As she grew older, she lost a lot of teeth in her mouth, and later she had to wear a pair of dentures. But since joining the senior model team organized by the school the year before last, some strange changes have happened to her. She used to ask her daughter to dye her hair before every performance, but one day when she was about to dye her hair again, her daughter told her that black hair had grown out of the roots of her white hair. She didn't pay attention at the time, but she didn't expect that after a few months, there were more and more black hairs, and now there are not a few white hairs on Li Guihua's head. "What's even weirder is that I actually have teeth again," Li Guihua said. At the beginning of this year, she always felt toothache. She initially thought it was a fever, but after taking many medicines, it didn't work, and the tooth still hurt. Once, when she was wearing dentures before eating, she suddenly felt very uncomfortable and felt like something was pressing against her teeth. After taking off the dentures, I licked my mouth with my tongue, and suddenly I felt something hard on the back molar. Li Guihua hurriedly looked in front of the mirror, and unexpectedly saw a new tooth growing on his gums. Not only that, Li Yuhua said that she used to have arthritis in her legs, and she would always make a "clicking" sound when she bent her legs, but recently her legs stopped making the sound when she moved them, and she walked much more briskly than before. . Li Guihua's series of physical changes not only surprised her family, but even her neighbors said she was "rejuvenated" and asked her for advice on health tips. "I don't have any health secrets," Li Guihua said. I usually have meals with my family. In addition to going to the school's senior model team on time to participate in activities, I also go out to dance every day, so I am very busy. "But, could it be the effect of some estrogen I took last year?" Li Guihua guessed, but he was not sure. Individual phenomena cannot be scientifically studied, and the reasons are difficult to explain. Faced with these "rejuvenated" old people, people can't help but wonder, can human age really be reversed in some people? If we find the secret of their "rejuvenation", then each of our bodies should be able to undergo such magical changes. With these questions, the reporter found Professor Tong Tanjun, an academician of the Chinese Academy of Sciences and Peking University Aging Research Center. He told reporters that some elderly people do have such a situation, but the reason is still unclear. Academician Tong explained to reporters that in real life, it is indeed found that some old people have black hair growing out of their white heads, some people have teeth, and even some old ladies have menstruation again after more than ten years of menopause. However, these people have not conducted a comprehensive physical examination to compare these surface changes with the body's endocrine indicators to determine why the body has such changes. And it depends on whether this phenomenon is a local phenomenon or an overall change. Only the overall "rejuvenation" is worth studying. These individual phenomena of "rejuvenation" are a good scientific research topic. However, the number of cases is small and difficult to collect. There are not enough cases for subject research. Even if one is found, it is difficult to compare his current situation with his past situation. These people and things often pass by like shooting stars. Although the phenomenon of "rejuvenation" has been seen, it is not possible to study it because the conditions are not complete, so the mechanism is not very clear. We can only guess that it is related to changes in people's mood, diet, and endocrine. Human aging is an irreversible process, and taking hormones can only delay aging. "Human aging is an irreversible process, which can be delayed but cannot be reversed." Academician Tong said that science is developing, but this statement cannot be overturned yet. Human aging is the overall aging process of the entire human body, such as the respiratory system, cardiovascular system, endocrine system, nervous system, etc.

The changes in body structure caused by aging cannot be reversed. After the puberty period, around the age of 30, people's body functions begin to gradually decline, and they embark on the aging process. In this process, although various cell tissues of the human body are constantly being renewed, as time goes by, the growth rate of new cells will gradually slow down, and the number of old cells in the human body will increase, and people will also Moving towards old age. Human aging is generally seen in appearance as hair turning gray and teeth falling out. However, clinical identification of aging has biological quantitative indicators in nerve, cell, respiratory, cardiovascular and other systems. After a comprehensive evaluation, we can see the degree of human aging. Speaking of the methods some people take to delay aging, such as taking hormones, Academician Tong said that after women go through menopause, taking estrogen can increase estrogen levels and cause menstruation. This is an artificial external force that makes a system get better. It’s hard to say how much of an overall effect some changes will have. This cannot be called "rejuvenating". Moreover, the use of estrogen is currently very controversial. Many researchers believe that estrogen can cause diseases such as breast cancer and reproductive system tumors. Doctor's point of view: Rejuvenation may be a harbinger of some diseases. Zhao Guifang, director of the Department of Gynecology at Beijing Geriatric Hospital, told reporters that the sudden "rejuvenation" phenomenon may be a harbinger of some diseases, and you should go to the hospital for examination in time. After a woman reaches the age of 45-50, her ovarian function deteriorates, her response to follicle-stimulating hormone and luteinizing hormone decreases, her menstruation stops, and she enters menopause. If menstruation suddenly occurs a long time after menopause, you must go to the hospital for examination, because this may indicate a malignant tumor in the uterus. Some elderly people suddenly have their hair turn black, especially if they are accompanied by tender skin and hypersexuality. This is likely to be caused by pituitary gland abnormalities and lesions. After the elderly lose their teeth, new teeth "grow in". The most common reason for this phenomenon is that the gums have receded, exposing the supernumerary teeth or residual roots that have not been removed from the gums. In addition, the sudden increase in appetite in the elderly may also be caused by abnormal thyroid hormone secretion or parasites in the body.