【结构】aged 40 的构成是：形容词 + 数词。

【用法】

aged 40 = 40 years old，在句中作表语，或后置定语。

He is a man aged 40. （定语）

He is aged 40. （表语）

以上两句，aged 40 都可以换成 40 years old。

He is a man 40 years old. 

He is 40 years old. 

He is a man aged 40. 的其他变式与表达（一共有8种）：

He is a man of 40.

He is a man of 40 years old.

He is a man of 40  years of age.

He is a man 40 years old.

He is a man 40 years of age.

He is a man age 40.

He is a 40-year-old man.