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老年医学是研究人类衰老的机理、人体的老年性特点和变化,以及老年病的防治。临床老年病学则主要涉及老年人常见病、多发病的诊疗方面问题。老年的年龄界线划分,按照国际老年组织的规定,亚洲、太平洋地区(含我国)的被定为60周岁(西方发达国家的为65周岁)。45～59岁称作初老期或老年前期。据上海医科大学多年积累的尸解资料表明,人体各器官组织的衰老改变在50～59岁阶段尚不算十分显著;60岁后则发展得很快(主要是体内水份减少、脂肪增加、细胞数减少、脏器萎缩、功能减退),是一个相当明显的转折点。90岁以上则目前多称长寿期。由于科学技术的突飞猛进,生活条件的不断改善,医疗保健的日益发达,使婴儿死亡率降低,
Geriatrics is to study the mechanism of human aging, aging characteristics and changes in the human body, and prevention and treatment of geriatric diseases. Clinical Geriatrics mainly involves the elderly common diseases, frequently-occurring problems in the diagnosis and treatment. According to the rules of the International Organization of Older Persons, Asia and the Pacific (including our own country) are designated as 60 years of age (65 years of age in western developed countries). 45 to 59 years old known as early age or early age. According to the accumulated information of autopsy from Shanghai Medical University for many years, it shows that the changes of senescence in various organs and organs of the human body are not yet significant at the age of 50-59 years old. However, the development of senescence after 60 years of age (mainly the reduction of body water, Reducing the number of cells, organ atrophy, dysfunction), is a fairly significant turning point. More than 90 years old now more than that longevity. Due to the rapid development of science and technology, continuous improvement of living conditions and the increasing development of health care, the infant mortality rate has been reduced.