shào​nián​lǎo​chéng

mature

少年老成 shào​nián​lǎo​chéng
mature idiom
acting with the wisdom, steadiness, or experience of an older person despite being young
staid idiom
lacking the energy, spirit, or vivacity typical of youth; excessively serious or stiff

Frequency

Movie subtitles
0.030 per million appears in 0% of films
Written text
0.209 per million

Sources

Definitions
CC-CEDICT