The woman was arriving at her home when she was met by the two men who forced her inside.
The men then woke the woman’s 73-year-old husband, demanding cash and other property, threatening the couple with a long knife or machete.
One of the men the punched the 73-year-old man in the face. He was later taken to Westmead Hospital for observation.
The offenders fled the property empty handed when a security alarm was activated.
They remain at large and have been described as wearing dark clothing and balaclavas.
Anyone who saw anything suspicious is advised to contact police.