This is the question asked by many aspirants like you.
What is the age limit for appearing in CAT entrance exam?
Lets rephrase the question: Is there any age limit in CAT? The simple answer is NO. There is upper or below age limit as long as you hold a valid graduation. So the question of what doesn't arise.
You can give CAT whenever you feel like going to school (Business School) either for upgrading your skills or for taking break from your career or for networking or just for adding another degree or diploma.
What are your thoughts?