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1·The mean age was 55 years.

平均年龄55岁。

2·They had a mean age of about 9 years.

他们的平均年龄是9岁。

3·The mean age of marriage is rising in both countries.

这两个国家的平均结婚年龄都有所上升。

4·The mean age at the initial episode was 32 years.

首次发作肉眼血尿的平均年龄为32岁。

5·The mean age for depression today is less than 15.

现在抑郁症人群的平均年龄小于15岁。

6·Mean age was 49 years and all participants were female.

参加实验的患者平均年龄为49岁，均为女性。

7·The mean age at death was 70 years and the male-to-female ratio was 3.6:1.

死亡的平均年龄是70岁，男女比例为3.6：1。

8·But there are linear correlation between population density and mean age.

种群密度与平均年龄有线性相关。

9·The mean age in the 1960s was 73 years to a mean of 79 years in the 1990s.

这就意味着平均发病年龄在1960年是73岁，然而到1990年会递增到79岁。

10·A total of 6360 subjects, mean age of 59 years, were included in the study.

总共6360例受试者，平均年龄59岁，均被纳入研究范围。