sentences:  Rose suggests that if a decline in the effect of natural selection is responsible for aging, then when this decline finally ends, at post-reproductive age, aging could halt.He reasons it follows that aging is "not a cumulative process of progressive chemical damage, like rust, at late ages, aging can stop".According to Rose, relative to the age of reproductive maturity a transition to the late-life stage of life occurs much later in humans than in the populations of flies for which there are data.