YOU SAID:

My cousin Johnny is eight and really dumb

INTO JAPANESE

私のいとこジョニーは8歳で本当にダムです

BACK INTO ENGLISH

My cousin Johnny is really dumb at age 8

INTO JAPANESE

私のいとこ、ジョニーは本当に8歳でダムです

BACK INTO ENGLISH

My cousin, Johnny is really dumb at 8 years old

INTO JAPANESE

私のいとこ、ジョニーは8歳で本当にダムです

BACK INTO ENGLISH

My cousin, Johnny is really dumb at age 8

INTO JAPANESE

私のいとこ、ジョニーは8歳で本当にダムです

BACK INTO ENGLISH

My cousin, Johnny is really dumb at age 8