Sam is five years old.

萨姆五岁了。

My son is five years old.

我的儿子五岁了。

He started his musical training when he was five years old.

他五岁时开始接受音乐训练。

Many children started work in factories when they were only four or five years old.

许多孩子在四五岁时就开始在工厂工作。

My son is five years old this year.

我的儿子今年五岁了。

My niece is five years old this year.

我侄女今年五岁。

He is fifty five years old this year.

他今年五十五岁。

My nephew is five years old this year.

我的侄子今年五岁。

Her nephew is five years old this year.

她的外甥今年五岁。

Her daughter is five years old this year.

她的女儿今年五岁了。