Those aged 68 underestimate their future happiness by 4.5 per cent, meaning they no longer face disappointment, the researchers found. The findings suggest that actresses Emma Watson and Kristen Stewart, both 23, should relish this year.

研究发现，只有4.5%的人到68岁时会低估他们的幸福程度，这意味着他们不再感到失望。根据这个研究，两位23岁的女演员艾玛·沃森和克里斯汀·斯图尔特都应该好好享受这一年。

If the research is borne out they will be optimistic but are likely to face disappointment in the next four decades. Previous studies have found that human contentment follows a U-shaped pattern, with those in their early twenties and the retired ranking highest.

如果该研究正确，那接下来40年里即使她们保持乐观心态，也更有可能遇到令人沮丧的事情。之前有研究显示，人们的幸福程度呈U形曲线状，刚刚二十几岁的年轻人和退休老人的幸福程度最高。

The pattern has been observed in more than 50 nations and across class and financial divides. And a study by the National Academy of Sciences in the US found evidence that even great apes can suffer a mid-life crisis.

这一曲线在50多个国家都适用，而且不分阶级、不分经济情况。美国国家科学院甚至发现就连高等类人猿也会受到“中年危机”的影响。

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