if you go on to the new moon page then go on to the articles theres one called the medow in edwards perspective. click on there and go to more articles by brown_x_eyes and on the second page theres a full biography for most of the characters, incase you need more information about any one else.
but this is part of what it saids for jaspar-
Jasper was turned into a vampire in 1863 by a vampire named Maria when he was 20 years old.
i havent edited this at all. ive just copied part of it. hope this helps.