he was 309
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.
In terms of the vampire ability. A tracker is a vampire who has the ability to track the movements of another vampire or human based on their scent, movement patterns and such as with the vampire Demetri, mental signature. Such vampires as James, Demetri and Alistair are trackers.
17
She was 18 when she was turned into a vampire by Carlisle.
she was nineteen
Jasper HALE was 20 years old when he was turned into a vampire by Maria in Texas.
Demetri Martin is 38 years old (birthdate: May 25, 1973).
As of the end of the 2013-2014 NFL season Demetri Goodson is 25 years old.
Charlie Bewley played the character Demetri in The Twilight Saga film series. Demetri is a member of the Volturi, a powerful vampire coven.
Bella Swan is turned into a vampire at the age of 18 in the "Twilight" series.
Alaric Saltzman is over 500 years old in "The Vampire Diaries" due to being a vampire. He was turned into a vampire during the show's first season.
Jhasper was turned into a vampire at the age of 19.
Claudia was 6 years old when she was turned in to a vampire by Lestat.