Hello aspirant

Eligibility for NDA , is to have passed xii STD between the age of 16.5 to 19.5

You will be given 6 chances to appear for NDA exam between the age of 16.5 to 19.5

As your age is 16 years six months , you are eligible for exam.

Other eligibility is to have minimum height 157. Martial status should be unmarried.