There is no age restriction for JEE Main. However candidates must have passed class 12 in 2017 or 2018 or are appearing in 2019. Application fees are also reduced. 2697 practice centres have been set up for allowing candidates to parctice and they are open on all days at certain timings. 

National Testing Agency (NTA) has released the application form of JEE Main 2019 for the January exam. Application form is available in the online mode. Candidates can fill the application form till September 30. All candidates who fulfill the eligibility criteria can apply for the exam. Before applying for the exam, candidates should check the eligibility criteria.
Keep the following items ready for the process of filling the application form of JEE Main 2019-
- Aadhaar Card or Aadhaar Enrollment Number, scanned images of passport, voter ID or any valid Govt ID.
- E mail ID and mobile number
- Scanned images of photograph and signature as per given specifications
- Details of class 10th and 12th standard.
- Credit/Debit/Net banking details if the fee is paid online

To fill the form, candidates can follow the given steps -
Step 1 – Fill the Authentication Form
Step 2- Filling of Online Application Form
Step 3 – Uploading of Scanned Documents
Step 4 – Payment of Application Fees
Step 5 – Printout of Acknowledgement Page

https://engineering.careers360.com/articles/jee-main-application-form

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