Hi

There is no age limit for applying for KCET ,but you need to be atleast 17 years of age and also you can apply for the KCET exam any number of times you want as long as you fulfill the eligibility criteria, which are

Candidates must be a citizen of India.

Candidates must have passed their class 12/PUC examination. Candidates who have appeared in their class 12/PUC examination and waiting for their result can also apply for KCET .

Candidates must have Physics and Mathematics as compulsory subjects in their class 12 along with Chemistry/ Biotechnology/ Biology/ Electronics/ Computer Science as optional subjects with English as one of the languages of study

Candidates passing from karnataka open state are not allowed to apply for KCET.

For more information visit:

https://www.google.com/amp/s/engineering.careers360.com/articles/kcet-eligibility-criteria/amp

hope this helps