YOU SAID:

I am not an eleven year-old

INTO JAPANESE

私はない、11 歳

BACK INTO ENGLISH

I'm not an 11-year-old

INTO JAPANESE

11 歳ではないです。

BACK INTO ENGLISH

It is not 11-year-old.

INTO JAPANESE

11 歳ではありません。

BACK INTO ENGLISH

At the age of 11 are not.

INTO JAPANESE

11 歳ではありません。

BACK INTO ENGLISH

At the age of 11 are not.