According to the general growth and development changes of mortal physiology, generally the development stage is before 25 years old, the mature stage is 25-44 years old, and the decline stage is entered after 45 years old.

Specifically, a person’s life can be divided into 8 ages 0-5 years old is immaturity, 6-11 years old is nonage, 12-17 years old is nonage, 18-24 years old is nonage, and 25-44 years old is in the florescence of life, 45 to 59 years old is the early old age, 60 to 89 years old is the old age, and 90 years old and over is the life period. Elders generally regard 45-59 years as the pre-senile period, 60-79 years as the low- age old age, 80-89 years as the advanced old age, 90-99 years as the life period, and over 100 years as the lifetime. The rearmost bracket of the Chinese Geriatrics Association is youthful people under 44 years old, pre-senile age 45-59 years old, senior people 60-89 years old, and long- lived senior people over 90 years old.

Human aging

Aging is the change in old age, also called aging. Aging isn't a miracle that occurs suddenly after a person passes middle age, but is the result of the nonstop changes in the colorful organs and systems of the body and the particular spiritual world throughout the life process. It's accumulated over a long period of time sooner or latterly. Obviously manifested. Some scholars believe that particular aging begins at birth. In this sense, the process of mortal life is the process of aging.

As a living organism, the mortal body must suffer a unified and complete physiological life process from embryo to birth, development, maturity, aging, and death in agreement with the laws of biology. As an organism with spiritual and social conditioning. The development, development, aging, and death of the mortal body are confined by spiritual and social factors.

Thus, particular aging includes five aspects

1. Aging is the increase in the accretive time of the life process.

2. Physiological aging After the mortal tissue reaches maturity, as time continues to pass and age continues to grow, a series of changes in the physiology and deconstruction of the tissue structure and physiological functions do.

3. Active aging is caused by physical aging, performing in dropped sensations similar as sight, hail, touch, and smell, dropped response capacities similar as memory, association, and thinking, dropped physical, internal, and emotional forbearance and duration, and dropped rigidity to internal and external environmental changes, Leading to a decline in overall mobility.

4. Cerebral aging: The cerebral changes caused by age aging, physical aging and active aging.

5. Social aging is caused by the changes in social places, social relations, social status, and interpersonal connections caused by the below-mentioned aging. The degeneration of physiological functions and physical fitness that do after an existent's maturity period is the base of all aging and belongs to normal aging. Colorful conditions can accelerate the process of physical aging, which is called complaint- convinced aging. Cerebral weakness can also accelerate the process of physical aging, which is called cerebral aging. Physical sins, conditions, especially cerebral sins, make it delicate for individualities to acclimatize to the social terrain and manage with changes in the social terrain. They can also accelerate the process of physical aging, which is called social aging.

Aging and hypoxia

After entering old age, the introductory physiological functions of the mortal body are degraded cell division, atrophy and degeneration, rudimentary metabolic rate diminishments, tissue elasticity decreases, connective tissue degeneration, nervous system degeneration, whim-whams- muscle response and conduction speed decelerate down, the strength and durability of the bone are reduced, and colorful factors that regulate the stability of the internal rotation are dammed. These introductory physiological functions are degraded, leading to the aging of colorful tissue systems throughout the body. There are

The aging of the cardiovascular system includes the heart and blood vessels of colorful sizes throughout the body. The heart is substantially composed of cardiomyocytes. With age, myocardial cells gradationally drop, accompanied by the deposit of adipose tissue, calcium mariners and lipofuscin, thickening of myocardial membrane and fibrosis. The aging of blood vessels is manifested by the thickening of the vascular intima, the narrowing of the vascular lumen, the increase in the consistence and hardness of the blood vessel wall, and the drop in pliantness, performing in a drop in blood inflow and a prolonged cycle of blood rotation, performing in inadequate oxygen force to the apkins. Generally speaking, the aging of the cardiovascular system begins the foremost. From the age of 25, the function of the heart is significantly reduced, and blood pressure also tends to increase. The heart of a 25- year-old youthful person can deliver 4 liters of oxygen per nanosecond to the cells. By the age of 70, it can drop by half, and can only deliver 2 liters of oxygen.

The aging of the respiratory system In the respiratory system, the aging changes of the lungs are the most egregious the alveolar wall thins and the pliantness decreases; the microvessels of the alveolar wall drop; the alveolar depression enlarges; the small bronchi tends to expand, and the entire lung pliantness decreases. Coupled with the sclerosis of the caricature cartilage, the caricature pen becomes hard and dropped, and the exertion of the intercostal muscles and abdominal muscles is weakened, performing in a greatly reduced ventilation function. An egregious sign is that the residual air volume of the alveoli of the senior has increased the residual air volume of the alveoli of a 60- year-old healthy person is nearly double that of a 30- year-old healthy person. Dropped respiratory function and exacerbated changes in heart function, forming a degenerative commerce between the heart and lungs, are an important part of the aging process.

The aging of the central system is manifested in the drop in the number of whim-whams cells, the deposit of lipofuscin and other substances in the whim-whams cells, and the drop of whim-whams response and conduction speed. These growing changes. Wood is only manifested as the decaying of thinking and motor functions, and more importantly, it has a comprehensive impact on the entire body function. Frequently due to disturbances in the stability of the internal terrain, it leads to metabolic changes, blood and oxygen force obstacles to the brain and myocardium, causing high Blood pressure, atherosclerosis, etc.

In addition, the digestive, endocrine, vulnerable, exercise and other systems of the senior have corresponding aging. The aging of each system affects each other, especially the decline in the content of colorful enzymes in the body and the function of the endocrine system, forming a comprehensive aging of the overall physiological function.

As a result of the below physiological aging, the quantum of oxygen taken by the senior is reduced, the capability to transport oxygen is reduced, and the effectiveness of using oxygen is reduced, so that the entire body tissue is in a habitual hypoxic state of varying degrees.

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