My grandpa's 80th birthday just happened this fall. It is crazy to think he's been on this earth since WWII, and this song suddenly reminded me of the utter mortality of life and how fragile we are. I am deeply terrified of losing my grandpa because I was actually very close with him throughout my entire life and have helped him with chores and such for a long time now. He was not the greatest man into adulthood and was by all accounts likely a terrible father but I still love him nonetheless because he did eventually get better as he aged. He reconnected with torn family connections and reestablished himself as an honorable family member, enough to make up for past wrongs.
I am very sorry for your loss, and I don't mean in a general generic way. I really mean that from the bottom of my soul. It's impressive my grandpa with progressing (basically) Parkinson's and diabetes has lived this long without forgetting who I am. He just lost his dog of over 10 years so that's a thing too. At least he has a younger wife supporting him, that's pretty much all he has left.
Our grandparents really are the good withering away.