Technically speaking as per the guidelines there is no age limit to give NEET 2020 exam, but you need to have qualified Class 12 or equivalent examination with Physics, Chemistry, Biology/Bio-technology and English as subjects.So to answer your question age should nit be a problem for you in giving NEET but you should make sure that you have cleared your 12th standard examinations from above mentioned subjects, for more information regarding the exam please refer, https://medicine.careers360.com/articles/neet