This sort of perspective explains why there are many conditions, such as Alzheimer's and Parkinson's diseases, retinal degeneration, type-2 diabetes and various cancers which are rare in early life but quite common in old age.

这种观点解释了为什么有许多疾病，例如阿尔茨海默病和帕金森病、视网膜变性、2型糖尿病和各种癌症，这些疾病在生命早期很少见，但在老年时却很常见。