7 sentences

1. 我爷爷今年八十岁了。

   wǒ yé​ye jīn​nián bā​shí suì le.

   My grandfather is eighty years old this year.

   Source: Dong Chinese Dictionary

2. 我外公今年八十岁了。

   wǒ wài​gōng jīn​nián bā​shí suì le.

   My maternal grandfather is eighty years old this year.

   Source: Dong Chinese Dictionary

3. 他爷爷今年八十岁了。

   tā yé​ye jīn​nián bā​shí suì le.

   His grandfather is eighty years old this year.

   Source: Dong Chinese Dictionary

4. 他的祖母快八十岁了。

   tā de zǔ​mǔ kuài bā​shí suì le.

   His grandmother is nearly eighty years old.

   Source: Dong Chinese Dictionary

5. 这张邮票的面值是八十分。

   zhè zhāng yóu​piào de miàn​zhí shì bā​shí fēn.

   The face value of this stamp is eighty cents.

   Source: Dong Chinese Dictionary

6. 这套公寓大约有八十平米。

   zhè tào gōng​yù dà​yuē yǒu bā​shí píng​mǐ.

   This apartment is about eighty square meters.

   Source: Dong Chinese Dictionary

7. 他八十岁了。

   tā bā​shí suì le.

   He is eighty years old.

   Source: Tatoeba