an old head on young shoulders

US /æn oʊld hɛd ɑn jʌŋ ˈʃoʊl.dərz/
UK /æn oʊld hɛd ɑn jʌŋ ˈʃoʊl.dərz/
"an old head on young shoulders" picture
1.

少年老成, 思想成熟

a child or young person who thinks and acts like an older, more experienced person

:
Despite being only ten, she has an old head on young shoulders and always offers sensible advice.
儘管她只有十歲,但她少年老成,總是提供明智的建議。
The new intern, though young, clearly has an old head on young shoulders, handling complex tasks with ease.
新來的實習生雖然年輕,但顯然少年老成,輕鬆處理複雜的任務。