The test gives an indication of ageing within population groups, but does not accurately measure the life expectancy of an individual, because of natural differences in telomere length.

这项测试给出了关于人群组的老化的印证，但是却没有因染色体端粒的自然差异，确切的测量出一个人的预期寿命。

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It seems like a pretty rudimentary test of conditioning, but Araujo found that it could predict life expectancy with alarming accuracy.

这看起来是一个相当基础的体能测试，不过阿劳霍医生发现它对于预测患者寿命令人吃惊的准确。

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But it says all men with a life expectancy of 10 years or more should have a baseline PSA test at the age of 40.

CNN: Let men decide on prostate screening, cancer society says