Hello,

According to the eligibility criteria of NDA exam, the age limit for the candidates are 16.5 to 19.5 years.

For NDA 1 exam 2021 the candidates must have born after July 2, 2002 and before July 1, 2005. Also, the candidates who have born between January 2, 2002, and January 1, 2006 are eligible for NDA 2 exam 2021.

So, you are eligible for NDA 2021.

Check the link for more details

https://competition.careers360.com/articles/nda-eligibility-criteria

Good luck!