NDA eligibility: age, education and physical standards

NDA is one of the few exams where you can prepare well, score well and still be turned away for a rule you never read. The birth-date window is narrow, the subject rule for the Navy and Air Force is fixed, and a few conditions — like marriage during training or a failed pilot aptitude test — end a candidature outright. Ten minutes with the notification now can save you a year of preparation aimed at the wrong entry.

This guide takes each condition in turn, shows you how to work out your own number of attempts, and ends with a checklist.

Nationality

A candidate must be one of the following:

• a citizen of India;
• a subject of Nepal; or
• a person of Indian origin who has migrated from certain listed countries (including Pakistan, Burma, Sri Lanka and some East African countries) with the intention of settling permanently in India.

Candidates in the second and third groups need a certificate of eligibility from the Government of India. The notification exempts Gorkha subjects of Nepal from this certificate. Almost every reader of this guide falls in the first group, but it is worth knowing the rule exists.

Age: a narrow window

NDA does not use a simple "maximum age". Each notification gives a range of birth dates that works out to roughly 16½ to 19½ years on the date the course begins. Two examples from the 2026 cycle:

Notice that the window moves forward by six months with each exam. That shift is what limits your attempts.

Your date of birth is taken only from your Class 10 (matriculation or secondary school) certificate or an accepted equivalent. Affidavits, horoscopes and municipal birth extracts are not accepted, and once you have entered a date of birth with UPSC, it cannot be changed later.

Worked example: counting your attempts

Suppose a candidate was born on 15 August 2009 and will sit the Class 12 board exams in early 2027. Assume the window keeps moving by six months each exam, as it usually does.

1. NDA-I 2026 (applied for in December 2025): the birth date fits, but the candidate is in Class 11 then. Class 11 students are not eligible. No attempt.
2. NDA-II 2026: now in Class 12 and born after 1 January 2008. Attempt 1.
3. NDA-I 2027: window starts 1 July 2008. Attempt 2.
4. NDA-II 2027: window starts 1 January 2009. Attempt 3.
5. NDA-I 2028: window starts 1 July 2009. Attempt 4.
6. NDA-II 2028: window starts 1 January 2010, and 15 August 2009 is earlier. Not eligible.

So this candidate has four attempts, and the first one falls in the middle of Class 12. Do the same exercise with your own birth date. Candidates born early in the year sometimes find they have one attempt fewer than they assumed.

Marital status

Only unmarried candidates may apply, and you must undertake not to marry until you complete your full training. The notification is blunt about the consequences: a candidate who marries after applying will not be selected for training, even if successful, and a cadet who marries during training is discharged and is liable to refund the expenditure the government has incurred on them.

Educational qualification

Candidates appearing in Class 12 can apply. They must then produce proof of passing by the date the notification fixes (for NDA-II 2026 this was 10 June 2027), and UPSC states that it will not extend this date for late board results. Class 11 students cannot apply.

Women candidates

Women have been eligible for NDA since 2021. Men and women sit the same written exam and the same SSB, but vacancies are notified separately and written results and final merit lists are prepared separately for each. For example, the NDA-II 2026 notification listed 394 approximate vacancies, of which 24 were for women. Vacancy numbers change every cycle, so check the current table. There is more in our guide for women candidates.

The Air Force: a one-time pilot aptitude test

If you choose the Air Force and clear the SSB, you take the Computerised Pilot Selection System (CPSS) for the flying branch. The notification says each candidate gets this test only once. If you fail it, you cannot apply again for the flying branch through NDA, and the result stays with you at later interviews. Candidates who fail CPSS, or who habitually wear glasses, can still be considered for ground duty branches and the other services, as per their choices.

Who is not eligible

• Anyone who has resigned or withdrawn on disciplinary grounds from a training academy of the armed forces.
• Anyone debarred by the Ministry of Defence from holding a commission.
• Candidates who cannot produce the educational certificates by the deadline.

Physical and medical standards

Candidates must meet the physical and medical standards set out in an appendix to the notification: height and weight, eyesight and colour vision, hearing, dental health and general fitness. Standards differ between the services; flying, for instance, has stricter requirements for eyesight. The medical examination comes only after the SSB, so many candidates discover a problem too late.

Some issues, such as being overweight or underweight, can often be corrected with a few months of work. Others cannot. Get a general check-up and an eye test early, compare the results with the published standards, and read our guide to NDA medical standards.

Common mistakes

• Trusting a rough age. "Under 19½" is not the rule; the notified birth-date range is.
• Assuming five or six attempts. Count them the way the worked example does.
• Choosing Air Force or Navy without PCM. Your application will not survive document verification.
• Entering a wrong date of birth. It cannot be corrected later, and a mismatch with your Class 10 certificate can lead to disciplinary action.
• Ignoring eyesight and weight until the SSB. By then there is no time to fix anything.

Your eligibility checklist

• My date of birth (as on my Class 10 certificate) falls within the notified range.
• I have counted how many attempts I actually have.
• I am unmarried and understand the rule until training ends.
• I have PCM in Class 12, or I know I am limited to the Army wing.
• I will have my Class 12 pass certificate by the notified date.
• I have checked my height, weight and eyesight against the published standards.
• If I want to fly, I know CPSS is a one-time test.

Quick check

1. Can a Class 12 arts student with no mathematics apply for the Army wing? — Yes, any stream is accepted for the Army wing.
2. Which subjects are needed for the Navy, Air Force and Naval Academy? — Physics, Chemistry and Mathematics in Class 12.
3. Which document decides your date of birth? — Your Class 10 or equivalent certificate.
4. Can a Class 11 student apply? — No.
5. How many times can you take the CPSS? — Once.

Once you are sure you are eligible, see how the exam itself is built in the NDA exam pattern explained.