Now, in a second study on ageing, there is the first evidence that "caloric restriction" has the same effect in primates.

现在，在衰老的第二次研究中，最早发现的是“热量限制”，在灵长类动物中有相同的效果。

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Research suggests that the reason for this could be the ageing effects of stress, and the persistent relaxation of facial muscles which can be an effect of long term anti-depressant use.

研究表明这种现象的原因可能是紧张导致的衰老效应，而脸部肌肉的持续松弛可能是长期服用抗抑郁药物的结果。

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Scientists hope to eventually create a drug which can mimic the effect of the found genes which could be taken to slow down, and even reverse the ageing process.

科学家们希望最终可以哀悼与这四种基因具有相同效用的药，减缓细胞衰老，甚至逆转衰老的过程。

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If so, following them over the years also picks up the happiness effect of ageing - which we might falsely attribute to marriage.

BBC: Why it's hard to measure happiness

Ill-designed pension systems magnify the effect of population ageing by creating incentives for people to retire ever earlier.

ECONOMIST: Time to grow up | The

The reduction in performance on these tasks associated with a 25-decibel hearing loss (classified as "mild") was equivalent to an ageing effect of seven years in cognitive abilities.

BBC: Viewpoint: Does deafness contribute to dementia?