The incident happened at a house on Main Street in Lack, Co Fermanagh.
Detective Constable Joanne Halliday said: “We received a report that sometime between 4.40 pm and 5.00 pm entry was gained to the property and a small amount of cash was taken.
“An older person was inside the property at the time of the incident but was not injured.
“It is despicable that an older and vulnerable person should have been targeted in this way.
“And we are appealing to anyone who witnessed anything suspicious in the area to contact detectives on 101, quoting reference number 1036 of 30/04/19.”
Alternatively, information can also be provided to the independent charity Crimestoppers on 0800 555 111 which is 100% anonymous and gives people the power to speak up and stop crime.