Hello Richa,
If you are asking about the eligibility criteria to appear for NIFT exam then as per the prescribed eligibility criteria of NIFT 2019, the candidates should be of 23 years of age as on October 1, 2018. There is age relaxation for candidates belonging to reserved categories.
Refer to the link below to check the detailed eligibility criteria-

https://design.careers360.com/articles/nift-eligibility-criteria

Good Luck!

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