Hi

You don't need to worry at all even if you are 38 years old as for neet 2021 there is no upper age limit because the case of upper age limit of 25 years is still pending in Supreme Court and until the supreme court its judgement is there is no upper age  limit

Yes, yes you are eligible for NEET even if you  study Biology as an additional /optional subject from NIOS.

This is because,

The eligibility of students with Biology as an additional / optional subject  is in the supreme court but until it gives its judgement students, these students are eligible for neet

Here's the eligibility criteria for NEET :-

-----------) Qualification required :-As per Neet eligibility to be eligible you must be either appearing for 12th board examination  or should have passed 12th board examination with physics, chemistry ,biology/biotechnology and English as core subject.

†††Important Note :- Students who have passed Biology as an additional subject are also provisionally eligible for neet until Supreme Court gives its judgement.

-----------)  Percentage required :- You must get

• at least 50 % in aggregate of PCB i.e Physics, Chemistry and Biology/Biotechnology in 12th examination if belongs to general category

• at least 40% in aggregate of PCB if belongs to st/Obc/ Sc

• at least 45 % in aggregate of PCB in case of pwd candidates to be eligible.

-----------)  Age limit :-to be eligible for neet  one has to be at least 17 years old or more by 31st December in the year of appearing for the examination i. e 31st December 2021 in case of neet 2021, no upper age limit as of now.

So, if you fulfill this Criteria then you are eligible for Neet examination and after qualifying get admission in Medical colleges as well

For detailed information about neet examination eligibility go through our page for which link is provided below; -

https://medicine.careers360.com/articles/neet-eligibility-criteria

Thank you