YOU SAID:

I were already forty in your age

INTO JAPANESE

私はあなたの年齢ですでに40歳でした

BACK INTO ENGLISH

I was already 40 years old at your age

INTO JAPANESE

あなたの年齢では私はすでに40歳でした

BACK INTO ENGLISH

At your age I was already 40 years old

INTO JAPANESE

あなたの年齢では私はすでに40歳でした

BACK INTO ENGLISH

At your age I was already 40 years old