YOU SAID:

i have a cat who is two years old

INTO JAPANESE

私は2歳の猫がいます

BACK INTO ENGLISH

I have a 2 year old cat.

INTO JAPANESE

2 歳の猫があります。

BACK INTO ENGLISH

2 year old cat.

INTO JAPANESE

2 歳の猫。

BACK INTO ENGLISH

2 year old cat.