YOU SAID:

I will soon be 16 years old and then i will be happy

INTO JAPANESE

私はすぐに16歳になり、その後幸せになります

BACK INTO ENGLISH

I will be 16 years old and then be happy

INTO JAPANESE

私は16歳になります

BACK INTO ENGLISH

I will be 16

INTO JAPANESE

16歳になります

BACK INTO ENGLISH

I will be 16