For me, he became most fully a father when I was an adult. Our closeness blossomed later in life, after his first heart attack. I think of all the years his bypass surgery gave us. More than two decades made possible by that operation and others that came later.
Dad seldom complained about the indignities of old age. Sometimes he'd make a joke about them, like the time he was entering the hospital for one of said surgeries and he pushed the revolving door all the way around to the outside again and kept marching away, a grin on his face.
But he went back, of course, did what he was supposed to do, and cheerfully. He always found a way to keep going, and to keep laughing. So I know that's what he'd want us to do, too.
Today, though, I can get a little sentimental. I don't think he'd mind.
(Dad in 2011, photographed in front of his childhood home.)