The mean age was 55 years.

平均年龄55岁。

youdao

They had a mean age of about 9 years.

他们的平均年龄是9岁。

youdao

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。

youdao

Parents of children age ten to seventeen were asked whether their child bullies or is cruel or mean to others.

VOA: special.2010.05.06

I mean, you grew up in an age when computers were blazingly fast, and have tons of memory, so why in the world do you care about efficiency?

我的意思是你们是伴随着,计算机快速发展成长的，计算机都有这么大的内存,那还在乎效率干嘛呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

The numbers start to drop off from there, and the mean age of a core gamer is 30.

FORBES: NPD Says Core Gamers are Numerous and Older Than You Think

The mean age at baseline was 68.6 years of age.

FORBES: Will Drinking Diet Soda Increase Your Risk For A Heart Attack?

Between 1970 and 2000 the mean age at which women had their first child in a range of OECD countries rose by more than a year every decade, and many more women now have their families in their 30s.

ECONOMIST: Most of the rich world is short of babies