Aging and degeneration timeline of various organs in the human body

Aging is something that everyone must experience, but did you know that different organs in the human body have different aging times and degrees? Today, I will tell you what are the best ways to fight aging? What are the precautions for delaying aging?

Without exception, we all think that gray hair and wrinkles are early signs of aging. In fact, some parts of the human body begin to degenerate before our appearance ages. The following is a timeline of aging and degeneration of some organs in the human body.

Brain: Starts to age at 20

As we age, the number of nerve cells (neurons) in our brain decreases. When we are born, the number of nerve cells is about 100 billion, but it starts 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, affecting memory, coordination and brain function. Wojtek-Rakowitz, a neurologist and consultant at Imperial College Healthcare Trust in London, said that although the role of nerve cells is crucial, it is actually the deterioration of the function of the gaps between brain cells that has the greatest impact on the human body.

Intestines: Start to age at 55

A healthy gut has a good balance between harmful and beneficial bacteria. Tom McDonald, professor of immunology at Barts and the London Medical School, said the number of friendly bacteria in our intestines starts to decline sharply after we reach the age of 55, especially in the large intestine. As a result, the body's digestive function declines and the risk of intestinal diseases increases. As we age, the flow of digestive juices in the stomach, liver, pancreas, and small intestine begins to decline, and the chances of constipation increase.

Breasts: Start to age at age 35

At age 35, breasts begin to lose tissue and fat, decreasing in size and fullness. From the age of 40, a woman's breasts begin to sag and the areola (the area around the nipple) shrinks dramatically.

Although the risk of breast cancer increases with age, it has nothing to do with physical changes in the breasts. Gareth Evans, a breast cancer expert at St Mary's Hospital in Manchester, said that human cells are more likely to be damaged as we age, so the genes that control cell growth may mutate and cause cancer.

Bladder: Starts to age at 65

At age 65, we are more likely to lose bladder control. At this point, the bladder will suddenly contract, even if it is not yet full of urine.

Women are more susceptible to bladder problems as they enter menopause and a drop in estrogen levels causes the urethra tissue to become thinner and weaker, reducing the bladder's support function. When people reach middle age, their bladder capacity is generally only about half that of young people. If your bladder can hold two cups of urine at the age of 30, it can only hold one cup at the age of 70. This can cause more frequent trips to the toilet, especially as the muscles become less elastic, which prevents the bladder from being completely emptied, which in turn can lead to urinary tract infections.

Lungs: Start to age at age 20

Lung capacity begins to decline slowly at the age of 20, and by the age of 40, some people begin to experience shortness of breath. This is partly because the muscles that control breathing and the chest cavity become stiffer, making it harder for the lungs to work. It also means that some air remains in the lungs after exhalation - causing breathlessness. At age 30, the average man inhales 2 pints (946 ml) of air with each breath, but by age 70, that number drops to 1 pint (473 ml).

Voice: Starts to age at 65

As we age, our voices become softer and more hoarse. This is because the soft tissue in the throat weakens, affecting the tone, loudness and quality of the voice. At this time, the woman's voice became more and more hoarse, and the sound quality became lower and lower, while the man's voice became weaker and the sound quality became higher and higher.

Eyes: Start to age at age 40

As vision declines, glasses become a hallmark feature of many people over 40. Farsightedness affects our ability to see objects up close. Andrew Roth, professor of ophthalmology at the University of Southampton in the UK, said that as we age, the eye muscles become weaker and the eye's focusing ability begins to decline.

Heart: Starts to age at 40

As our bodies age, the heart begins to become less efficient at pumping blood throughout the body because blood vessels gradually lose their elasticity. Arteries may also become hardened or blocked. These changes are caused by fat accumulation in the coronary arteries: eating too much saturated fat. The blood supply to the heart is then reduced, causing angina. Men over 45 and women over 55 are more likely to have a heart attack. A new study by a British pharmaceutical company has found that the average heart age of the British is five years older than their actual age, which may be related to their obesity and lack of exercise.

Liver: Starts to age at 70

The liver seems to be the only organ in the body that challenges the aging process. "Liver cells have an amazing ability to regenerate," explains David Lloyd, consultant liver surgeon at Leicester Royal Infirmary in the UK.

He said that after a piece of liver is removed surgically, it will grow into a complete liver within three months. If the donor does not drink alcohol or take drugs, or has not suffered from an infectious disease, the liver of a 70-year-old can be transplanted to a 20-year-old.

Kidneys: Start to age at 50

The amount of kidney filtration begins to decrease at the age of 50. Renal filtration can filter out waste from the bloodstream. The consequence of reduced renal filtration is that people lose the ability to hold urine at night and need to go to the bathroom more often. The kidneys of a 75-year-old filter half the amount of blood as those of a 30-year-old.

Prostate gland: starts to age at age 50

Professor Roger Gibby, director of the London Prostate Centre, said the prostate gland often enlarges with age, causing problems including increased need to urinate. This is benign prostatic hyperplasia, which afflicts half of all men over 50 but rarely affects men under 40. The prostate absorbs a large amount of testosterone, which accelerates the growth of prostate cells and causes prostate hyperplasia. A normal prostate is about the size of a walnut, but an enlarged prostate can be as large as an orange.