Hi Nidhi,
According to the eligibility criteria for NATA 2018, there is no age limit for appearing the exam. You can apply for it. The application form are available till 2nd March 2018. You can apply from the link https://engineering.careers360.com/articles/nata-application-form. For more details go throughb the link https://engineering.careers360.com/articles/nata-eligibility-criteria.
All the best!!
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