Hello,

In order to appear for NEET, candidates need to fulfill the following eligibility criteria;

Attained 17 years by 31st December of the  appearing year.

Passed or appearing 10+2 from a recognized board with Physics, Chemistry, Biology/Biotechnology and English as core subjects.

PCB Aggregate inclusive of theory and practical needs to be achieved against one's respective category-

UR - 50%

SC/ST/OBC - 40%

PWD - 45%

As of now there is no upper age limit, hence no restrictions in terms of number of attempts, now coming to your question if you're aiming for NEET 2022 then you have already attained 17  years as on 14th Jan of 2022, you need to fulfill the other criteria as in terms of subject combinations, passed/appearing 10+2 level, aggregate, etc.