The average age of first marriage has risen steadily for decades.

过去几十年来，初婚的平均年龄一直在稳步上升。

youdao

youdao

The average age of the women interviewed was only 21.5.

受访女性的平均年龄只有21.5岁。

《柯林斯英汉双解大词典》

And the experts say the average age of people found to have the disease is between 20 and 50 years old.

VOA: special.2009.01.06

OK. Now. Think for a second about computing the average age of the faculty.

好，想想怎么,计算全体教员的平均年龄吧。

麻省理工公开课 - 计算机科学及编程导论课程节选

If the average age of death was something like forty-five, maybe a fifty-fifty chance of--high risk-- of one of the parents dying.

那么这个概率其实很低,不是吗,大概有高达50%的可能性,双亲中的一人会死去

耶鲁公开课 - 金融市场课程节选

Malcolm Downey from HSENI said that the average age of those killed was 57.

BBC: Concern over rise in Northern Ireland farm deaths

Along the way, the average age of Buick buyers in America fell from 76 to 64.

FORBES: My Surprising Lust For Buick

The average age of the seven elected heads of state on our list is 56.

FORBES: This Is What 57 Looks Like: Beauty, Power And Happiness At Middle Age