这是一个比较常见的搭配，用于表示某人的年龄：

at 54 years of age=at the age of 54

除以上常用表达外，还可以用：

at (age) 54

at 54 years old

补充例句：

At 14 years of age, she became the younest player to compete at Wimbledon. 她14 岁时成了参加温布尔顿比赛的最年轻的选手。

At 78 years of age, he’s still undisputed leader of his country. 78岁时，他仍是他的国家公认的领袖。

比较：

Saul entered Yale at 19 years of age. 索尔 19 岁考上了耶鲁大学。

Saul entered Yale at the age of 19. 索尔 19 岁考上了耶鲁大学。