前面可以加the，例如：

1.Adjust your language to the age of your audience.要根據聽眾的年齡使用相應的語言。

2.The age of the earth is reckoned at about 4 600 million years.估計地球的年齡大約為46億年。

3.She entered public life at the age of 25.她25歲時開始了經常拋頭露面的工作。

age of 前面可以加the。at the age of 是固定搭配，意為“在……歲時”。例如：

My brother joined the army at the age of eighteen. 我哥哥十八歲參軍。

需要注意的是：“ at the age of+基數詞”可以和“when sb. was+基數詞”同義句轉換。例如：

My daughter went to college at the age of sixteen. = My daughter went to college when she was sixteen years old. 我女兒十六歲上大學。

表示特指，指特定的時間，例如：

1.'The age of corporatism must be put firmly behind us,' he proclaimed.“必須堅決讓社團主義時代成為過去，”他宣布道。

2.The age of hedonism is being ushered out by a new era of temperance.享樂主義時代正讓位於一個注重節制的時代。