New born vampires need to feed once a day for the first few months of life. A half gallon of blood is required. Soon that drops to once every three days. After a year, they only need to drink blood once a week. In time, that number slowly raises. At the fifty year mark, a vampire need only drink blood every two weeks. At 100 years, twice a month is fine. The older vampires are able to sustain themselves on feeding once a month. After nearly 300 years, their metabolism has reached perfection. They only need to feed once every year to sate their bodies.
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