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四十五岁至六十五岁的中老年人是人类一生中机体结构和机能活动不断发生变化下降的一个时期。这一时期的变化是一个相当复杂的生理过程。从生理学角度来说,中老年人生理上的变化是机体新陈代谢衰退的结果,同时也是生物学和社会因素相互作用的结果。人到老年,无论在精神上还是体力上都不可避免地要发生衰退,但是人类衰老的个体差异很大,老
The 45-year-old and 65-year-old middle-aged and elderly people are a period of declining changes in the structure and functioning of human beings throughout their lives. This period of change is a rather complex physiological process. From a physiological point of view, the physiological changes in the elderly are the result of the body’s metabolic decline, but also the result of the interaction between biological and social factors. People to the elderly, both in mental and physical inevitably have to decline, but the aging of individuals vary greatly, the old