As far as I am concerned, midlife starts at thirty or before.

那我自己来说吧，在三十岁甚至更早的时候就开始了我的中年生活。

youdao

Harvard's endowment is valued at thirty-five billion dollars.

哈佛的捐赠基金价值350亿美元。

youdao

Just imagine: he died at thirty-five and he wrote six hundred pieces of music.

你想，他死的时候才三十五岁，可是他已经写了六百首曲子。

youdao

The team looked at thirty years' worth of information on food security and agricultural policy in Gambia, Ivory Coast and Mali.

VOA: special.2010.03.23

The thirty-year mortgage came in the early 1950s but it seems to have gotten stuck at thirty-year.

0世纪50年代初出现30年期的贷款,这之后期限不再增加

耶鲁公开课 - 金融市场课程节选

You can see how it's laid out. This is the Frost who published that book. This is Frost at thirty-nine, Frost in a suit made by a London tailor in London.

可以看看是怎么排列的，这个是弗罗斯特,当时发表那本书的时候，这个是他39岁，在伦敦穿着伦敦裁缝做的西装。

耶鲁公开课 - 现代诗歌课程节选

In fact, the oldest officer on board was first lieutenant John Clements Wickham, at thirty-three.

FORBES: Unleashing the Energies of the Digital Cowboy Generation

At thirty, I renounced that other me and I went back to being me.

NEWYORKER: Utopian for Beginners

The year was 1862, a war was raging, and Higginson, at thirty-eight, was the local authority on physical fitness.

NPR: Excerpt: 'White Heat'