Buck Magnut,I truly understand how you feel.
My father who is 75 now got alzheimer when he was 60.He started me hunting when I was 12 yrs old.There is not a time when I get a deer that I don't think of him and all that he taught me.I feel like you that maybe I am being cheated out of something because I know he would of had more years to hunt with me.But I also know he gave me some of the best years of his life so I could enjoy hunting and you will never forget the memories you have with your grandfather.I wish you both well.