 The study examined the relationship between age and four diabetes factors, insulin resistance, first and second phase of insulin secretion, and glucose effectiveness in a population of Chinese adults with a normal fasting plasma glucose level, 90 milligrams per deciliter, and body mass index, men, 23 kilograms per square meter, women, 22 kilograms per square meter. Age was found to be negatively associated with all four diabetes factors in both genders. In particular, age was negatively correlated with insulin resistance and glucose effectiveness in women, while it was negatively correlated with the first and second phase of insulin secretion in men. This article was authored by Li Yinghuang, Qihao Lu, Fang Yuqin, and others.