hi,

cds exam happens twice a year. the following age criteria is applicable to appear in cds exam:

For Indian Military Academy (IMA), unmarried candidates born not  before than January 2, 1997 and not later than January 1, 2002 can only apply.

For Indian Naval Academy (IMA), unmarried male candidates born not earlier than January 2, 1997 and not later than January 1, 2002 are eligible.

for Air Force Academy candidate should be between 20 to 24 years as on January 1, 2021 (born not earlier than January 2, 1997 and not later than January 1, 2001).

For Officers’ Training Academy (SSC Course for men), unmarried male candidates born not before than January 2, 1996 and not later than January 1, 2002 are eligible for the exam.

For Officers’ Training Academy (SSC Women Non-Technical Course), candidates should be unmarried and born not earlier than January 2, 1996 and not later than January 1, 2002.

so you are not eligible for any of the post as per age criteria.