Idk but I always thought it was weird the coincidence with vampires. They live forever. They need the boood of the young or they die. Meanwhile. If you put the blood of a young person into your body it’s very good for you. I thought that was weird. I’d like to think it’s one of those things that got passed down. Cause I also think we had a global society once and it got wiped out. Dropped our numbers to near extinction