Hello,

As long as you fulfill the eligibility criteria for NEET which has been mentioned below, you can appear for NEET;

• Attained 17 years as of 31st December of the appearing year,
• Passed 10+2 from a recognized board with Physics, Chemistry, English and Biology/Biotechnology as core subjects,
• Secured PCB aggregate inclusive of theory and practical, for UR it's 50% aggregate, for SC/ST/OBC it's 45% aggregate, for PwD it's 45% aggregate,

As of now there is no upper age limit, and NIOS candidates too are eligible to appear for NEET, hence if you fulfill the aforementioned criteria you can appear for NEET, the gap years won't have any impact .