Hiii

There is no issue in taking a gap from studies, there is no age once can study at any stage of life. No issues will be there for you if you take a gap but yes you will have to check the age restrictions if any before applying for any particular course. Since you have not mentioned which course you are planing to apply to so i will answer in general
For NEET there is no age restrction anyone fulfiling the other criteria can apply. Same is for JEE. And for other courses except LLB there is generally age limit of 25 years So if you let us know the course you want to know about we can help you better.

Hope this helps.

Thanks!