lǎo​chéng

mature

老成 lǎo​chéng
mature adjective
appearing or behaving in a way that is older or more sophisticated than one's actual age
experienced adjective
possessing extensive experience and a steady, reliable character

Frequency

Movie subtitles
0.390 per million appears in 0% of films
Written text
1.05 per million

Sources

Definitions
CC-CEDICT