Yes you can appear for the Combined Defence Services examination as the age limit eligibility criteria says the age to be between 20 to 24 years of age and as you are 21 right now, you are eligible to appear for the CDS exmaination this year. You can give exams of Indian Military, Naval forces, Air Forces Academy.
The other important eligibility criterias are The minimum acceptable height for male candidates is 157.5 cm. for Army, 157 cm for Navy and 162.5 cms for Air Force. The minimum height of women candidates’ should be 152 cm.
REFER TO THE LINK BELOW TO GET A MORE DETAILED INFORMATION ABOUT THE CSD exam -
https://competition.careers360.com/articles/cds-eligibility-criteria
Best wishes. Thankyou.
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