Hi

NDA EXAM Eligibility - Age criteria

Minimum Age is 15.7 years (not later than 1st January 2005)/ 16 years during the commencement of course.

Maximum Age is 18.7 years (not earlier than 2nd January 2002)/ 19 years during the commencement of course.

It should be clearly noted that only candidates, who are not born earlier than July 2, 2002, and not later than July 1, 2005, are eligible to appear for  NDA 1 Exam.For NDA 2 2021, candidates must be born between January 2, 2003, and January 1, 2006.

So you maynot be eligible.

https://www.google.com/amp/s/competition.careers360.com/articles/nda-eligibility-criteria/amp