Venkatesh, there is no upper age limit for NEET. So as long as you fulfill the eligibility criteria which is completing your 12th, passing in all subjects and securing a minimum aggregate of 50% in Physics, Chemistry and Biology you are eligible for NEET. It is 50% for General Category, 45% for PWD and 40% for OBC,SC,ST. If you uflfil this minimum aggregate criteria, you are eligible for NEET. There is the age criteria that says you should be 17 years atleast by December 31st of the year of admission and you do fulfil that criteria. So if you have secured the required aggregate in Physics, Chemistry and Biology against your Category, then even with gap between your 11th and 12th, you are eligible for NEET.