老成

shào nián lǎo chéng

少年老成

young but steady

wéi rén lǎo chéng chí zhòng

为人老成持重

be mature and cool-headed

tā zuò rén lǎo chéng bù huì yóu zuǐ huá shé

他做人老成，不会油嘴滑舌。

Honest and forthright, he is a no glib-tongued man.

cǐ rén bù gòu lǎo chéng

此人不够老成。

This person is not mature enough.

tā nián líng dà le rén yě lǎo chéng le

她年龄大了，人也老成了。

She's older and more mature.

tā shì gè cōng ming lǎo chéng de nián qīng rén

他是个聪明老成的年轻人。

He is a smart and steady young man.