Hello student eligibility of GATE examination are as mentioned below -

Eligibility - Candidates must have passed graduation in engineering/technology or Masters degree in any relevant science subject. Candidates in their final year are also eligible to appear in GATE entrance examination.

There's no age limit for Gate examination.

For more details refer to the link mentioned below - https://www.google.com/amp/s/engineering.careers360.com/articles/gate-eligibility-criteria/amp

Feel free to comment if you've any doubt

Good luck