Aging and longevity.
An excerpt from the book "Vampires.".
Officially, vampires never die of natural causes, the vampires are aging, not just in the same way as humans. Vampires do not age at the molecular / genetic level, but on their way of life. Because of hunting they have a great wear in the form of bone and tissue injury. Vampires are dangerous to society, most vampires were destroyed long before the outward signs of aging and the determination of the outer limits of their life.
Many facts can be emphasized from the ancient sources, for example, in ancient China, was one vampire, presented the imperial court eastern Zhou dynasty, at the age of 550 years. There are also more accurate modern records that confirm that vampires can live for over 200 years. The photo shows the 125 year old vampire, who was photographed in Spain in 1901. Note the curved spine and the absence of hair.
Contrary to the opinion of many scholars, longevity of vampires is not a result of the pact with the devil, but rather depends on the vampire from his damaged DNA, which occurs during cell division, the conversion of a normal human into a vampire. In particular, the protective caps at the ends of chromosomes. Their DNA may have the ability to resist aging, but the appearance will change dramatically over time. For example, the fat reserves the vampire shrink several times and his skin becomes thinner and more transparent. In the first place and affects its appearance, which dries up eventually becoming like dried. Also, the vampire becomes more pronounced curvature of the spine, and some of them lose all their hair for 10 years of transformation.
Despite its weak form and decrepitude, old vampires are very strong, agile, fast, have unusually great intelligence, easily mastered the art of seduction and can easily monitor and control the mortals, are committed to self-discipline and easily heal the wounds on his body. Many vampire hunters underestimate their abilities and made a fatal mistake, which led them to gibili.