Hello Aspirant,
See in most of the MNCs age limit does not matters for campus placement until and unless you are more than 30 and not much skilled as per the role of company because if the person is more in age then definitely he/she should have some experience because there will be an usual question that if you are over-aged as compared to your friends then what did you have extra in you with respect to skills, experience and exposure.
Now as far as age limit for colleges are considered so yes some colleges have upper age limit for admission to some specific courses so you should check that once from the official website of different colleges including NITs/IIITs/JMI or for whichever institution you are seeking admission.
I hope this information helps you.
Good Luck!!
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