YOU SAID:
hi today is my birthday i turned 12 years old.
INTO JAPANESE
こんにちは今日は私の誕生日です12歳になりました。
BACK INTO ENGLISH
Hello Today now 12-year-old is my birthday.
INTO JAPANESE
こんにちは今日、12歳は私の誕生日です。
BACK INTO ENGLISH
Hello Today, the 12-year-old is my birthday.
INTO JAPANESE
こんにちは今日、12歳は私の誕生日です。
BACK INTO ENGLISH
Hello Today, the 12-year-old is my birthday.
You've done this before, haven't you.