老当益壮

dì zhì duì li yǒu fēng huá zhèng mào de hòu shēng dàn shì yě yǒu lǎo dāng yì zhuàng de qián bèi

地质队里有风华正茂的后生，但是也有老当益壮的前辈。

In the geological prospecting team, there are promising young members as well as vigorous veteran members.

wǒ zhōng xīn pèi fú nǐ lǎo dāng yì zhuàng de xiá yì jīng shen

我衷心佩服你老当益壮的侠义精神。

I heartily admire your gallantry and youthfulness.