Hey, JustinCy, I really hope that you’re joking but if your not and if you think that ejaculation and teen pregnancy is caused by "Demons" I think you need to take a step back and seriously think about what you are saying. Though I try not to make fun of people for their believes I have to ask you, do you also believe in the tooth fairy and Santa Clause?
Demons were made up by people to answer the questions raised by some weird occurrence. Instead of looking at evidence and at the observations and coming to a logical conclusion, you can just say a demon did it. It is a bit like seeing a shooting star and claiming that it was superman.
As for the guy supposedly living for that long without food or water, unless he found a way to convert his urine into useable nurturance it is medically impossible. He would be as dry as a bone after a few weeks. Your cells need water and food to survive or they die.
I think a more reasonable conclusion is that he has been sneaking in food or someone has been giving him food. Also why would a demon" posses an old man and just sit around and not eat? Not very interesting life if you ask me.