He was taken to hospital by EHS for treatment of non-life-threatening injuries, and police arrested a female suspect who remains in police custody.
The victim and suspect are known to each other.
Members of the Major Crime and Forensic Identification Units are on scene to investigate; charges are pending.
UPDATE: Both individuals were charged and released. The 19-year-old female will appear in Sydney Provincial Court on April 2nd, to face a charge of Assault with a Weapon; the 20-year-old male faces a charge of Assault and 2 Breaches, and will appear in Court on April 9th.