I think Scully is immortal, in episodeAlso there was another episode whereClyde Bruckman he can see people's death and told Sully she doesn't die.death was coming for people and it passed this guy up so he was living forever. Later in the episode Scully was about to die, and he said don't look at it, and it took him instead. Which in turn passed her up.
I am sure I didn't explain this well, trying to remember, it's been way to long.
Sorry. Didn't see the first paragraph.