You can attempt AIIMS until you are 30 year old . So , there is no uptil you are 30 years old . You must consider Physics , Chemistry and Biology as main subject for qualifying in AIIMS. So , best of luck and be positive you can clear it and remember AIIMS have very limited seats.

Hello Harish !

There is no limit to the number of attempts. One can attempt AIIMS until 30 years of age.

All the best !