The idea of an older gentleman wishing to be young is not that uncommon but I like the way that you were able to make this a reality. Unfortunately, the grammar and punctuation issues make it difficult for me particularly to proceed properly but I will do my best. Also, nothing really flows properly. One minute he is in the dream, then he wakes up, only to go right back into the dream again. It seems very jumbled together, very rushed. Also, the way he goes from a wheelchair to a walker seems abrupt. If I'm understanding this correctly, it seems like every time he goes to the dreams, he wakes up a little healthier? If not, then the way he is wheelchair bound, then next thing you know he is walking with a walker is a little unrealistic, even for a fiction novel.
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Also, in the second chapter, the whole scene where he is 'dying' but still 'alive' is very awkward and difficult to follow in my opinion. Something needs to be fixed in there so that it flows properly so readers can understand. Is he a ghost at that point? Is he watching this from a different perspective? It seems to me that one minute he is in the bathroom standing up, then the next, people are carrying him off in a body bag.
Those were just a few things that really stood out to me. This is a very interesting plot with lots of potential, but it also needs a lot of work as well. Best of luck with everything!