They have three grown-up children.

他们有三个成年的孩子。

《牛津词典》

I seem to have everything anyone could want–a good husband, a lovely home, grown-up children who're doing well.

我似乎拥有任何人想要的一切–好丈夫,可爱的家和已长大成人、有出息的子女。

《柯林斯英汉双解大词典》

Now her grown-up children help her to bring up their young brothers and sisters.

现在，她的成年子女帮她抚养自己的弟弟妹妹。

youdao

British parents, stuck washing and cooking for their grown-up children, are typically less enthusiastic.

ECONOMIST: Young adults have become reluctant to fly the family nest

Mr Mutharika, a church-going Catholic has four grown-up children by his Zimbabwean wife, Ethel, who died in May 2007.

BBC: Bingu wa Mutharika (back) and Bakili Muluzi (front)

Russian officials said Tito, who is divorced with three grown-up children, received the equivalent of a professional cosmonaut's training.

CNN: Space tourist feels 'great' in orbit