YOU SAID:

once i was 7 years old.

INTO JAPANESE

かつて私は7歳でした。

BACK INTO ENGLISH

Once upon a time I was 7 years old.

INTO JAPANESE

昔々、私は7歳でした。

BACK INTO ENGLISH

Once upon a time, I was seven years old.

INTO JAPANESE

昔々、私は7歳でした。

BACK INTO ENGLISH

Once upon a time, I was seven years old.