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Alice was changed in 1901, the same as Edward.
around 1901
Aidan Porter
no one really knows who turned Alice but it is believed that an elderly vampire turned her 2 save her from the tracker James
Any age, you can be born a vampire or you can be turned into one!
youngest of the age that he turned into a vampire because he turned into a vampire at age 17.
She was turned in the 1900's era[ sometime in the 1900's] Mary Alice [Alice Cullen] when she was a human she had premonitions so...They took her to a mental asylum and a old vampire at the asylum changed her to protect her from James ,since he was after her.And that's why as a vampire she has visions.
David was turned into a vampire at the age of 18, like all the other witches in 'The Bloody World' series
Demetri's exact age when he was turned into a vampire is not specified in the Twilight series. His past as a human is not elaborated on, and his age as a vampire is also left ambiguous.
I believe it was Mary Alice Brandon? Somebody correct me if I'm wrong.
Before she was turned into a vampire, Alice Cullen was left in a mental institution due to her ability to see the future, which was a shock to her human family. She was treated poorly and subjected to cruel methods, which led to her escaping and being turned into a vampire by a friend who worked at the institution.
neither. Alice was created then years later saw the cullens in a vision and joined them.