Hello Aspirant,

Hope you are doing good.

As per the criteria prescribed for the CDS examination ( for OTA)  unmarried male candidate born not earlier than 2nd January ,1998  and not later than 1st January 2004 are only eligible. So according to this criteria , you have an attempt to appear for CDS examination (for OTA). and the maximum age limit for OTA is 25 years.

Hope this information helps you.

All the best.