Hello  Rohan Singh

I hope you are doing good. As per your query, I would like to know you that maxmium age to give nda exam is 19.5 year . According to your age you will turn 18 on 11 january 2022 so you are sure elgiible to appear for the exam for both the attempts of 2022 and first attempt of 2023.. I request you to start studying hard and dont miss the opportunity

Hope you found this answer helpful. Good luck for your future