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

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.

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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