Watkin D M
Clin Geriatr Med. 1987 May;3(2):237-52.
With the technical life span of humans (TLSh) as a foundation, a taxonomy consonant with modern medical science is presented which redefines the chronology of the terms middle-aged, aging, elderly, and aged. This redefinition is one inducer of behavioral change preceding attitudinal change needed to reach the goal: rectangularity of the survival curve. The indivisible triad of nutrition, health, and aging is the principal target for behavioral change at which health professionals can aim their resources during all phases of the life cycle.
以人类技术寿命（TLSh）为基础，提出了一种与现代医学科学相一致的分类法，该分类法重新定义了中年、衰老、老年和高龄等术语的时间顺序。这种重新定义是行为改变的一个诱因，而行为改变是实现生存曲线呈矩形这一目标所需的态度改变之前提。营养、健康和衰老这一不可分割的三元组是行为改变的主要目标，在生命周期的所有阶段，健康专业人员都可将资源投向这一目标。
