젊었을 때

when I was young

→ 젊다
phrase Rare #26,428
when I was young Used to talk about something that happened during one's youth. The subject is often understood from context, and the expression can also be used with other subjects, such as 젊었을 때의 엄마 (my mother when she was young).
KO: 젊었을 때는 여행을 많이 했어요.
EN: When I was young, I traveled a lot.

내 동생이 수녀 였는데 젊었을 때 죽었어

My younger sibling was a nun, but she died young.

— 8과 1/2 (1963)

엄마 젊었을 때 꼭 닮았어

You look exactly like Mom did when she was young.

— 마녀배달부 키키 (1989)