Hi,
I am glad to answer this question. As per Eligibility criteria mentioned by AFMC, the minimum age for MBBS program in Armed Forces Medical college is 17 years while the maximum age is 24 years. Since you are 21 right now and will be be turning 22 in aug, so your are eligible to apply for AFMC MBBS course provided you should also fullfill other eligibility criteria.
I hope this will answer your query.
Good luck!!!
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