平均年龄55岁。
They had a mean age of about 9 years.
他们的平均年龄是9岁。
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。
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。
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。
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。
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