Correct

老成

/ lǎochéng / 
Strokes

Definition

mature/experienced/sophisticated

Example

As an Adjective

experienced and steady

1
Tā
他
wéirén
为人
lǎochéng
老成
  
,
bùhuì
不会
yóuzuǐhuáshé
油嘴滑舌
  
。

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

2
Shàoniánlǎochéng
少年老成

young but steady