Priestess Anna is actually a hundred-year-old woman who looked like she was still a teenager.
The answer is magick.
The woman was known for her magick— anti-aging magick— that she used to create some cream and sell them to rich housewives that wanted to maintain their beauty.
As for the money, she gave everything to the chairman and the chairman used it to maintain the village.
It wasn't a really large business but just enough for them to take care of the village maintenance. When the Chairman told them about introducing them to the Priestess, he told them this was nothing but an act of courtesy.
The Priestess was considered the oldest of the witches here. Because of this, it is only right that they pay her a visit just as they needed to visit the other oldest supernatural living here.
The Priestess was just their first stop.
