Not stupid, but perhaps trivial:
Roger Bannister is still alive.
My dad was in the Air Force; from first to fifth grades I attended four schools in as many states. In each school I read in a textbook about Roger Bannister's boyhood injuries and how he overcame them to be a famous runner. In adulthood, when I thought of him and his inspiring story, I assumed that he had long since passed away.
A few weeks ago I was talking about schooldays to my wife, who didn't remember ever reading about him, so I looked him up in wikipedia.
I'm forty-six. I first read about Roger Bannister forty years ago. He's still alive.