YOU SAID:

I am sixteen, going on seventeen

INTO JAPANESE

私は16歳、17歳

BACK INTO ENGLISH

I am 16 years old, 17 years old

INTO JAPANESE

私は16歳、17歳です

BACK INTO ENGLISH

I am 16 years old and 17 years old

INTO JAPANESE

私は16歳と17歳です

BACK INTO ENGLISH

I am a 16-year-old and 17-year-old

INTO JAPANESE

私は 16 歳と 17 歳

BACK INTO ENGLISH

I'm a 16-year-old and 17-year-old

INTO JAPANESE

私は 16 歳と 17 歳

BACK INTO ENGLISH

I'm a 16-year-old and 17-year-old