I am in THE SAME SITUATION. My dad is 71 years old.
he had a large bleed in the left side of his brain. The doctor has him on a ventilator to keep swelling and pressure down and also to prevent more bleeding. The doctor tells us that my dad is not unresponsive but I KNOW thats not true. The cause of his injury is still unknown. I wish we had some kind of info just for peace of mind but its good to know there are others out there in this same terrifying and unfortunate predicament.
Hang in there, you're not alone.
Unfortunately it happens all the time. ( I don't know what the actual statistics are.)
I think it's great that you're here, and asking; you're dad is very lucky to have you. Visit stroke sites and continue to ask questions. You may not get answers right away, but you'll get support and caring from some very special people.
I had a bleed in 1996 at the age of 36.
Take care,
Sue