全球人口老龄化是21世纪人类所面临的主要问题之一。目前老年人的生活质量日益受到重视,已成为世界各国共同关注的问题。在不同国家人口中的老年人所占的比例与其经济状况,风俗习惯,医疗卫生条件,地理环境,气候等许多因素有密切关系。世界卫生组织(WHO)规定,60~75岁为年轻老人,76~90岁为老年人,90岁以上为长寿老人。我国第六次人口普查中65岁以上的人口占总人口的8.87%,说明我国已进入老龄化社会。所谓老 Global population aging is one of the major problems facing humankind in the 21st century. At present, the quality of life of the elderly is receiving more and more attention and it has become a common concern of all countries in the world. The proportion of the elderly in different national populations is closely related to many factors such as their economic status, customs, medical and health conditions, geographical environment and climate. The World Health Organization (WHO) stipulates that young people aged 60-75 years, elderly people aged 76-90 years, and longevity elderly people over 90 years old. China’s sixth population census accounted for 8.87% of the total population over the age of 65, indicating that our country has entered an aging society. The so-called old