YOU SAID:

When I was five years old; I was a stupid kid.

INTO JAPANESE

私が5歳のとき私は愚かな子供でした。

BACK INTO ENGLISH

I was a foolish kid when I was 5 years old.

INTO JAPANESE

私は5歳のとき私は愚かな子供でした。

BACK INTO ENGLISH

I was a foolish kid when I was 5 years old.