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Dr Buys and her colleagues followed over 78, 000 women between the ages of 55 and 74 who had no family history of ovarian cancer, for an average of 12 months.

拜斯博士和她的同事对78000位妇女进行了平均长达12个月的跟踪研究，她们的年龄在55岁到74岁之间，家族成员都没有卵巢癌患病史。

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It says girls between the ages of three and six own an average of about twelve.

VOA: special.2009.04.06

Back in 1950, the average retirement ages for men and women in the OECD were 64.5 years and 63 years respectively.

ECONOMIST: Pension sums don��t add up

Private school students do better on the National Assessment of Educational Progress, but the gap between average scores is about the same at ages 13 and 17 as at 9.

FORBES: Public Choice

By 2025, the report forecast, growth would decline to an annual average of 5%, as the Chinese work force ages, productivity slows and infrastructure and other investments produce lower returns.

WSJ: China Reform Suggestions Vague on Party Role