在更年轻的时期进行衰老相关问题的评估和干预，对于延缓衰老进程、延长健康寿命、减轻老龄化的负担具有重要意义，同时尽可能早地加强对以高血压、冠心病、糖尿病等为代表的老年慢性疾病的综合防控，才能真正从长远上控制老年时期这些疾病的进展及并发症，切实减轻全社会的负担。因此，将45~59岁的人群定义为亚老年人群。针对这部分人群，借鉴老年综合评估的方法，建立亚老年的健康评估体系，并据此进行系统性的干预，这对于老年医学的发展、个人、家庭及社会都具有重要的意义。

The medical and health related expenditures related to the aging is a huge burden on the country and the society. The geriatrics gradually becomes a hot spot in the clinical medicine. The core problem in the gerontology and the geriatrics is the senescence, along with related issues. But, the senescence starts actually as early as just after the human sexual maturity. Geriatrics deals with the secondary stage of senescence. If the assessment and the intervention of senescence-related issues can be carried out at a younger age, the senescence process will be delayed, the healthy life span will be extended, and the burden of the aging can be reduced. At the same time, the rapid growth of the elderly chronic diseases, such as the hypertension, the coronary heart disease and the diabetes, happens often in the middle-aged stage. Only by strengthening the comprehensive prevention and control of these diseases as early as possible can we control the progress and complications of these diseases in the long run and effectively reduce the burden of the whole society. Therefore, we might call the population of 45~59 years old the sub-elderly group. For this part of the population, it is important to adopt the method of the comprehensive geriatric assessment, to establish a sub-elderly health evaluation system, and to carry out systematic interventions.