3 sentences

1. 老人家已九十高龄，但体格依然康强。

   lǎo​rén​jiā yǐ jiǔ​shí gāo​líng, dàn tǐ​gé yī​rán kāng qiáng.

   The elderly man is ninety years old, but his physique is still robust.

   Source: Dong Chinese Dictionary

2. 这位百岁高龄的老人家身体依然很硬朗。

   zhè wèi bǎi suì gāo​líng de lǎo​rén​jiā shēn​tǐ yī​rán hěn yìng​lǎng.

   This centenarian is still in very good health.

   Source: Dong Chinese Dictionary

3. 爷爷虽然已经是九十岁的高龄，但依然耳目聪明，视力极好。

   yé​ye suī​rán yǐ​jīng shì jiǔ​shí suì de gāo​líng, dàn yī​rán ěr​mù cōng​ming, shì​lì jí hǎo.

   Although my grandfather is already ninety years old, his hearing is still sharp and his vision is excellent.

   Source: Dong Chinese Dictionary