周岁

jīn tiān shì wǒ nǚ ér mǎn zhōu suì de rì zi

今天是我女儿满周岁的日子。

Today is my daughter's first birthday.

tā shí zhōu suì le

他十周岁了。

He's ten years old.

luó mǎ ní yà de fǎ dìng chéng nián nián líng shì zhōu suì

罗马尼亚的法定成年年龄是18周岁。

The age of majority in Romania is eighteen.