Hello aspirant,

Now you are 15 years 8 months. As per the eligibility criteria given, you are eligible for NDA 1 and NDA 2 in 2023 and 2024.  Candidates must have completed 12 th standard or equivalent exam from a recognised Board for Indian Army and Physics and Mathematics is compulsory subjects for Indian Air Force and Naval. Candidates between 16.5 years to 19.5 years are eligible for NDA.

For NDA 2 - 2023, candidates must have born not earlier than January 2, 2005, and not later than January 1, 2008.

For NDA 1, candidates should be born not earlier than July 2, 2004 and not later than July 1, 2005.

For more information go through below mentioned link.

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

Hope this information was helpful to you.

Best of Luck!!