A human is a mortal being who lives without any magical or paranormal powers. Humans are only one of the seven known species after doppelgängers, ghosts, hybrids, vampires, werewolves, and witches. As the human race repletes the majority of the Earth’s population, they are commonly noted for their desire to influence and understand the environment, by seeking to explain and manipulate phenomena through mythology, philosophy, religion, and science.
The human race is the oldest species known to man.
Humans generally have a short life-span when compared to other sentient species. Vampires and hybrids are ageless, witches can slow down their aging, and ghosts can keep on existing and influencing the world around them if they find a way. However, since Katherine Pierce was cured of her vampirism and she was over 500 years old she is technically the oldest known human being alive as well as older than any witch seen so far and even older than most vampires.