You ever browse around on Wikipedia, looking up people you are curious about, come to one you’re pretty sure is dead, and find out that person is still living? I went through that myself a bit ago. I was looking up some Doctor Who stuff and was reading about Michael Gough, who played the Celestial Toymaker in an old Hartnell episode. I could’ve sworn he was dead and had died just a few years ago, but no. He’s still alive!
I’ve had this happen before, though I don’t remember the names of anyone it happened with. It’s always a little surprising and unsettling, but in a very good way. 🙂