Dear Khun Narinee,
this is very unfortunate, but if you do not have an appointment today, we cannot accept your application form.
You can also apply once you are 16 years of age, but need to proof German language skills to the level of C1, meaning you have to be fluent in German.
However unfortunate this may be for you, the fact, that you are turning 16 on 12.01.2016 has been obvious for a long time and a better planning could have saved you the inconvenience now.
Best regards,