Most of the firefighters were in their twenties and two of them were less than twenty, though several were older.

大多数消防员20多岁，其中两名不到20岁，但也有几名年龄更大。

youdao

Twenty years later, he got in touch with the children, who, by then, were in their early twenties.

二十年后，他和孩子们取得了联系，那时他们才二十出头。

youdao

AN: Speaking of practicing, you have recommended, "Doing your twenties." That is, with a slow metronome setting, play the segment correctly twenty times. Then do something else for a while.

说到练习，你推荐这样一句话，“做你的二十次”那就是，在一个慢的节拍器设置下，正确地演奏段落二十次，然后做一下其他的事情。

youdao

You had two founders in their twenties and Eric was twenty years older and you had to make that relationship work between people who did not know each other.

FORBES: Ken Auletta's 'Googled'

Samantha Henig, her daughter, is in her late twenties, with a twenty-first-century version of the same career. (She has worked as a Web editor and writer at several publications, including this one, and is now the online editor of the New York Times Magazine.) Together, trading the writing in tag-team fashion, they assess the key departments of twentysomething life school, careers, dating, family-making, and so forth and try to discern how much has actually changed.

NEWYORKER: Semi-Charmed Life