YOU SAID:

I was 16 years old when I was 16, now i'm 18

INTO JAPANESE

私は16歳の時に16歳で、今は18歳です

BACK INTO ENGLISH

I was 16 when I was 16 and now I'm 18.

INTO JAPANESE

私は16歳の時に16歳で、今は18歳です。

BACK INTO ENGLISH

I was 16 when I was 16 and now I'm 18.