Hello Dear

There is not such any type of age limit but there will be a fix limit for writing the entrance exam inorder to take the admission in NITs. Every candidate's will get three attempts for writing the JEE mains & two attempts for writing the JEE Advance and in that among one attempt you have 2 chances to write the JEE mains i.e overall you have 6 chances for writing the JEE mains entrance exam inorder to boost your chance for taking the admission in any of the elite premises of NIT.

All the best