From ancient times to the present, people have been searching for the mystery of human aging, because as long as the real cause of aging is found, it is possible to find a way to slow down the aging process of body organs from a certain angle and at a certain level, so as to master health preservation, health care and The right way to exercise. Aging is an irresistible natural law. We need to understand the law of human aging in order to effectively supplement and delay aging.
The brain begins to age at the age of 20. As people get older, the number of nerve cells (neurons) in the brain gradually decreases. The number of nerve cells reached about 100 billion when a human was born, but it began to decline year by year from the age of 20. By the age of 40, the number of nerve cells begins to decrease at a rate of 10,000 per day, which affects memory, coordination and brain function.
The lungs age from the age of 20. Vital capacity begins to decline slowly from the age of 20, and by the age of 40, some people become panting. Part of the reason is that the muscles that control breathing and the chest cavity become stiff, making it more difficult for the lungs to function. It also means that some air will remain in the lungs after exhalation, causing panting.
The skin begins to age around the age of 25. As the production of collagen (which serves as the backbone of the skin) slows down, and the elasticity of elastin, which allows the skin to rebound quickly, decreases or even breaks, the skin begins to age naturally around the age of 25. Dead skin cells will not fall off quickly, and the amount of new skin cells generated may be slightly reduced. This results in fine lines and thin, transparent skin, even though the first signs may not appear until people are around 35 years old.
Muscles begin to age at the age of 30. Muscles have been growing and failing; growing again and failing again. The balance of this process for young people is very good. However, after the age of 30, the rate of muscle failure is greater than the rate of growth. After 40 years of age, people’s muscles begin to decrease at a rate of 0.5% to 2%. Regular exercise may help prevent muscle aging.
Bones begin to age at the age of 35. Children’s bones grow very fast and can be completely regenerated in just 2 years. It takes 10 years for an adult’s bones to regenerate completely. Before the age of 25, bone density has been increasing. Bone loss began at the age of 35 and entered the natural aging process. Bone loss is faster in postmenopausal women, which may lead to osteoporosis. The reduction in bone size and density may result in a decrease in height, and the bones in the middle of the vertebrae may shrink or shatter. At the age of 80, people’s height will drop by 5 cm.
Breasts age from 35 years old. When a person reaches the age of 35, the tissue and fat of the breasts begin to lose, and the size and fullness of the breasts decrease as a result. From the age of 40, a woman’s breasts begin to droop and the areola (the area around the nipple) shrinks sharply. Although the risk of breast cancer increases with age, it has nothing to do with physical changes in the breast.
Fertility began to decline at the age of 35. As the number and quality of eggs in the ovaries began to decline, women’s fertility began to decline after the age of 35. The endometrium may become thinner, making it difficult for fertilized eggs to implant, and creating an environment that resists sperm. Male fertility also begins to decline at this age. Men who get married after the age of 40 are more likely to have a miscarriage due to poor sperm quality.
Eyes age from 40 years old. With the decline in vision, glasses have become a hallmark feature of many middle-aged people over 40 years of age, hyperopia, which affects our ability to see objects close. As we age, the eye muscles become weaker and weaker, and the focusing ability of the eyes begins to decline.
The heart ages from the age of 40. As the human body gets older, the efficiency of the heart’s delivery of blood to the body begins to decrease. This is because the blood vessels gradually lose their elasticity, and the arteries may also become hard or blocked. The cause of these changes is the accumulation of fat in the coronary arteries: Eat too much saturated fat. The blood delivered to the heart then decreases, causing angina pectoris. Men over 45 years old and women over 55 years old are more likely to have a heart attack.
Teeth begin to age at the age of 40. When a person gets older, the amount of saliva secreted decreases. Saliva can wash away bacteria, reducing saliva, people’s teeth and gums are more perishable. After the periodontal gum tissue is lost, the gums will shrink, which is a common condition in adults over 40.
The kidneys begin to age at the age of 50. The amount of kidney filtration begins to decrease at the age of 50. Renal filtration can filter out waste in the bloodstream. The consequence of the reduced amount of kidney filtration is that people lose the ability to hold urine at night and need to go to the bathroom many times. A 75-year-old man’s kidney filtration blood volume is half that of a 30-year-old man.
The prostate begins to age at the age of 50. The prostate often grows with age and causes problems including increased frequency of urination. This is benign prostatic hyperplasia, which affects half of men over the age of 50, but men under 40 rarely suffer from benign prostatic hyperplasia. Absorption of a large amount of testicular hormones by the prostate will accelerate the growth of prostate cells and cause prostate hyperplasia. A normal prostate is the size of a walnut, but a hyperplastic prostate is the size of an orange.
The intestines begin to age at the age of 55. A healthy intestine can provide a good balance between harmful and beneficial bacteria. As a person ages, the flow of digestive juices in the stomach, liver, pancreas, and small intestine begins to decrease, and the chance of constipation increases.
Hearing begins to age around 55 years of age. More than half of people in their sixties suffer from hearing loss due to aging. This is called presbycusis, which is caused by the loss of “hair cells”.
Taste and smell begin to degenerate at the age of 60. There are about 10,000 taste buds on our tongue at the beginning of our lives. After getting old, this number may have to be halved. After 60 years of age, people’s sense of taste and smell gradually decline, partly as a result of the normal aging process. It may speed up due to problems such as nasal polyps or sinuses. It may also be the result of years of smoking.
The bladder ages from 65 years old. At 65, you are more likely to lose control of your bladder. At this point, the bladder will suddenly contract, even if the urine has not yet filled the bladder. Women are more susceptible to bladder problems. As they enter menopause, the urinary tract tissue becomes thinner and weaker due to the decline in estrogen levels, which reduces the supporting function of the bladder. In middle age, the bladder capacity is generally only about half of that of young people. If the bladder can hold two cups of urine at the age of 30, it can only hold one cup at the age of 70. This will cause more frequent visits to the toilet, especially the decrease in muscle flexibility, so that the urine in the bladder cannot be completely emptied, which in turn leads to urinary tract infections.
Voice ages from 65 years old. As people grow older, their voices become softer and more hoarse. This is because the soft tissues in the throat are weakened, which affects the sound quality, loudness and quality of the sound. At this time, women’s voices became more and more hoarse, and the sound quality became lower and lower, while men’s voices became weaker and weaker and higher and higher.
The liver begins to age at the age of 70. The liver seems to be the only organ in the body that can challenge the aging process. David Lloyd, a consultant liver surgery consultant at the Leicester Royal Infirmary in England, explained: “The regeneration ability of liver cells is very powerful.” He said that after surgery to remove a piece of liver, it will grow into a complete liver within 3 months. . If the donor does not drink alcohol or drugs, or has not suffered from infectious diseases, the liver of a 70-year-old man can also be transplanted to a 20-year-old young man.