She has a grown-up son.

她有个已成年的儿子。

《牛津词典》

Jan was almost a grown-up.

简几乎是个大人了。

《柯林斯英汉双解大词典》

The child was clearly puzzled at being addressed in such a grown-up way.

这孩子显然对别人用这种成年人的方式称呼他感到纳闷。

《牛津词典》

Newspapers have lost millions of readers as a new generation has grown up.

VOA: special.2009.03.21

It was a little primitive establishment almost a commune in which Welles being a teenager, the grown-up will have a great time.

那是一个原始的建筑,就像一个小社区，在那里,威尔斯度过了少年。

麻省理工公开课 - 电影哲学课程节选

So they've only grown up with one American family. So that's a really, really big difference.

只有一个是美国家庭的孩子。所以这差别还是很大的。

欧洲和美国的差异 - SpeakingMax英语口语达人

Now is the time for her to act like a grown up and do the hard work of building the country.

FORBES: Argentina Has the Power to Avoid Catastrophe

"The prime minister would be well advised to read carefully what they have said and respond in a grown up fashion, " he said.

BBC: NEWS | UK | Politics | Diplomats slam Blair on Mid-East

Mr. SARJERI: I don't know, but I'm feeling like I'm living there - there are bad things and I'm like maybe not a grown up, I'm still a kid.

NPR: Young Iraqi Refugees in Syria Miss Schools