YOU SAID:

Once I was 20 years old

INTO JAPANESE

かつて私が20歳のとき

BACK INTO ENGLISH

Once when I was 20 years old

INTO JAPANESE

20歳の時に一度だけ

BACK INTO ENGLISH

Only once when I was 20 years old

INTO JAPANESE

20歳の時に一度だけ

BACK INTO ENGLISH

Only once when I was 20 years old