Nearly 60% of those who were grown up affluent now consider themselves to be in a lower class.

英訳に間違いが有れば正してください。

裕福に育った人々の60%近くが今や自分自身を下層にいると考えている。
Nearly 60% of those who were grown up affluent now consider themselves to be in a lower class.

ヒント
育った

答え were grownをgrewにする

Nearly 60% of those who grew up affluent now consider themselves to be in a lower class.

growを他動詞で使うときは、
植物を育てるや髪、角などを生やすという意味で使う。

主語+grow up
主語が育つ