Hello student as per your DOB you can appear in NDA 2021 and 2022 as per eligibility criteria Candidates should be between the age group of 16.5 to 19.5 years to apply.

Eligibility - Candidates must passed class 12 for Army and class 12 in Physics and Mathematics for Airforce and Navy.

For more details refer to the link mentioned below - https://www.google.com/amp/s/competition.careers360.com/articles/nda-eligibility-criteria/amp

Feel free to comment if you've any doubt

Good luck