YOU SAID:

My horse ran to the super market and turned forty

INTO JAPANESE

私の馬はスーパーマーケットに走って40歳になった

BACK INTO ENGLISH

My horse ran to the supermarket and was for for0 years old.

INTO JAPANESE

私の馬はスーパーマーケットに走り、0歳の時でした。

BACK INTO ENGLISH

My horse ran to the supermarket when he was 0 years old.

INTO JAPANESE

私の馬は0歳の時にスーパーに走った。

BACK INTO ENGLISH

My horse ran to the supermarket when he was 0 years old.