YOU SAID:

I should not be twenty-one by now

INTO JAPANESE

私は今は21歳になるべきではない

BACK INTO ENGLISH

I should not be 21 at the moment now

INTO JAPANESE

今は21歳にはならない

BACK INTO ENGLISH

I will not be 21 years old now

INTO JAPANESE

私は21歳にはならない

BACK INTO ENGLISH

I will not be 21 years old

INTO JAPANESE

私は21歳にはならない

BACK INTO ENGLISH

I will not be 21 years old