Kev, I completely understand where you're coming from here. I am an only child, and was the first grandson in my family on either my father's or mother's side. All four of my grandparents were or are singularly exceptional, at least to me--the memories just don't seem to fade in significance.
My maternal grandfather passed away from lung cancer when I was 9, at 61, in 1971 at the VA hospital in Long Beach, which is 10 minutes away from where I now live--oddly enough--I suspect that he was murdered by that "killer nurse" that was poisoning the terminal patients--they didn't catch him until the late 70's! Thanks to him I had my first taste of LUCKY beer when I was two years old--he fell asleep and the freshly opened beer was still ice cold on a hot evening. Although I'm not a nightly drinker, I still lift a cold beer now and then and think fondly of him--the town's best auto mechanic, and a damn good carburator specialist. Gram' divorced him decades ago, and is still going strong at 88, and has four grands between mom and my uncle--I have three cousins, two guys and a gal--each of them has given her two great-grands, for a total of 2 great-granddaughters and 4 great-grandsons...and she loves it. Gram's mom, my great-grandma, lived until 1987, and passed at the ripe age of 92, I was 24 or 25 when that happened.
My paternal grandfather passed away in 1989 of heart failure attributed to old age he was in his mid 80's, and gram' in 1998, in her early 90's, of system shutdown associated with advanced alzheimers.
I still can't visualize any of them any way other than how they were as I was growing up...and my earliest memories of them still have them all with dark hair. Still, there isn't a week that goes by that I don't remember some pleasant memory from our past and think fondly of any of them, however briefly. I hope that your recollections of your time with each of yours will be as sweet.