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The vision she had showed Jasper using his abilities and attacking humans to feed before she saw what their life could be like with the Cullens.
Because Alice often takes the lead when she and Jasper interact with others, there was an early perception that she might have been a bit older, or that he was more recently turned than she was. Born at the turn of the twentieth century, Alice ended up in the asylum where she would become a vampire in 1920.
The two didn’t have the same experiences with other vampires.
As a result, Jasper was much more wary about interacting with new ones. She explained to Jasper the visions she had of their life together, and how the Cullens would take them in as family, not as soldiers.
One staff member protected her from more invasive “therapies,” though he couldn’t protect her from shock treatment.
When he discovered the vampire James was after Alice, he turned her so she could protect herself.