Hello Ahmadulla.

See JEE MAINS and ADVANCED see two engineering entrance exams which give admission to the students in the good govt colleges such IITs , NITs , IIITs , GFTIs. 

The age limitation is only up to 25 years but there is one criteria too that u must be giving the exam consecutively for two years for JEE ADVANCED and three times for JEE MAINS. So u can apply for it when u are in class 12th as latest.

Hope u got ur point. ask for any query.

Good luck

Hello Ammdullah

There is no age limit to be eligible for JEE Main 2019. However, candidates need to pass 10+2 or the equivalent examination in 2017 or 2018. Candidates appearing for 10+2 or equivalent exam in 2019 are also eligible to apply irrespective of their age.

As per the recent order by Supreme Court, candidates of 25 years or older can also apply for JEE Advanced 2019. However, the admissions of such candidates will be provisional till the final outcome. (Source: Careers360)