Jasper became a vampire in 1843.
20 years old
He was about 20 years old.
She was 18 when she was turned into a vampire by Carlisle.
Jasper Hale is the oldest of the Cullen adopted children, if you mean by the year they became a vampire. Next in line is Edward, followed by Alice, Rosalie and finally Emmett. In age when they became a vampire, Emmett and Jasper and Alice were all 20 years old, Rosalie was 18 and Edward was 17.
Jasper Hale was born at some point in 1843, because Jasper was turned into a vampire in 1863 by a vampire named Maria when he was 20 years old.
20. He was born in 1843 and turned in 1863.
Edward Cullen became a vampire in 1918 at the age of 17.
Jhasper was turned into a vampire at the age of 19.
Jasper was Aged 20.Here's a little more detail on the subject:"After becoming a major in the Confederate Army, Jasper was beset upon by the vampire Maria, who proceeded to turn him. After the transformation, Jasper aided Maria in her creation of a newborn vampire army which successfully conquered the feeding grounds of Texas. However, Jasper became disillusioned with this violent life and eventually became a nomad. Fortunately, he was eventually found by Alice, the love of his life and with her began a life with the peaceful coven of the Cullen Family."Taken From http://twilightsaga.wikia.com/wiki/Jasper_Hale
he was 17 and always has and will be 17 cos vampires are immortal. He was born in 1901 and turned into a vampire in 1918.
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