Tamara Harris of the National Institute on Aging, because other activities, such as free-radical oxidation and possibly telomere shortening, also contribute to the body's slow decline.

国家老年研究所的塔玛拉·哈里斯说：“不可能仅仅有一种永驻青春的不老药，因为其它活动如自由基氧化作用和缩短调聚作用放慢身体退化的过程。”