Birthdate
Torres' birthdate – Torres stated in (VOY: "Extreme Risk") that she was nineteen when she quit Starfleet Academy and by 2376 it was ten years since she entered the Academy and ten years since she last spoke with her mother. (VOY: "Equinox, Part II", "Barge of the Dead"). Torres quit the Academy in her second year at age nineteen in 2368, that puts her birth year 2349.
The Official Star Trek Voyager Companion gives further evidence to Torres' age. This is a passage taken from the book: "B'ELANNA TORRES is a half Klingon, half Human in her twenties who is frantically working at the consoles of the barely spaceworthy craft..."
Read more about this topic: B'Elanna Torres