You can check the age limit -

Age Limits:

    Minimum Age: 16.5 years

    Maximum Age: 19.5 years

The date of birth will be calculated as it is entered in the Matriculation or Secondary School Leaving Certificate or in a certificate recognised by an Indian University as equivalent to Matriculation.
For further information you can go through with given below link.
NDA Eligibility

Yes you can sit and give exam of nda

National Defence Academy & Naval Academy Examination

Application | Eligibility | Admit Card | Preparation Tips | Result | Answer Key | Cutoff

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