"In addition to advancing paternal age being associated with an increased risk of male infertility, there appears to be other adverse changes that may occur to the sperm with ageing.

“父亲年龄过大不仅和男性不育风险增加有关，男性变老似乎还会对精子产生其他负面影响。”

"For example, just as people lose muscle strength, flexibility and endurance with age, in men, sperm also tend to lose ‘fitness’ over the life cycle.”

“例如，正如人们变老后肌肉会失去力量、柔韧性和耐力一样，精子也会在这一过程中变得越来越虚弱。”

As for the reasons behind this, Bachmann suspects it’s down to the natural decline in testosterone levels man experience as they age, in addition to a reduction in semen quality.

至于这一现象背后的原因，巴赫曼怀疑是因为男性变老时睾酮水平随之自然下降，与此同时精液质量也降低了。

When men age they become more predisposed to sperm degradation, the study found, which, during conception, can lead to heredity mutations in the DNA cells of the offspring that prompt a number of disorders.

研究发现，当男性变老时，精子退化的倾向进一步加强。精子退化会在受孕时导致后代的DNA细胞发生遗传突变，从而引发多种病症。

predisposed[,pri:di'spəuzd]: adj. 先有倾向的，先有意向的

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