The Centers for Disease Control and Prevention estimate that about 4.4 million children, including about four percent of those aged 4 to 6, have ADHD.

疾病控制与防治中心调查结果表明，大约四百四十万儿童，包括4至6岁儿童的4%患有多动症。

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Researchers say it may take far less exercise than people had thought to lower the risk of heart disease especially for the highest risk group, middle-aged men.

研究人员表示，想要减低罹患心脏病的机率，并不像一般人所认为的要做许多运动，尤其是针对高危险群的中年男人而言。

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They selected as their subjects 206 cognitively healthy subjects aged 70 to 90 who had already been genotyped as part of the Alzheimer's Disease Neuroimaging Initiative.

他们选取了206名年龄介于70-90岁之间健康老年人作为他们的研究对象，同时这些受试者也是老年痴呆症神经成像启动计划的部分参与者。

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Bobby Moore's widow Stephanie, who set up a fund for bowel cancer research in memory of England's World Cup-winning captain, who died of the disease aged 51, said she hoped the campaign would save thousands of lives.

BBC: Cancer pilot targets soccer fans

More and more gene tests are emerging that aim to predict the course of disease in middle-aged and older people who are already sick.

FORBES: Gene Tests That Predict When You Will Die

The Williams sisters have aged and suffered injuries, and, in the case of Venus, a chronic autoimmune disease that has kept her on the sidelines.

WSJ: Why Complain When Tennis Girls Just Want to Have Fun?