Hi Ms Shipra Kaushal,
Thank you for posting your query.
It is unfortunate that your grandfather has suffered a stroke
and is unconscious.
The chances of recovery depends not only on age but also on the location and size of stroke in the brain.
Generally, older people have poor chances of recovery.
If you can upload the report of CT/MRI
brain, I would be able to give better answer.
Please get back if you require any additional information.
Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad,
My personal URL on this website: http://bit.ly/Dr-Sudhir-kumar
My email: firstname.lastname@example.org