Don't give up, no matter what anyone says! Every case is different. My dad had a stroke at the age of 68. Everyone said: old man, while a 78-year-old man was recovering next to us.
It is a fact that with age, the chance of improvement is often smaller, and the damage is often permanent – we were aware of this. They predicted that he would be bedridden. Today he walks with a cane. Although he is unfortunately not able to take care of himself, he has improved a lot.
Try the training, because in this state, community and support are very important, and the method is also effective. Although there is no panacea, willpower is limitless.
I wish you much success and perseverance!