A 35-year-old man from Greenfields has been charged with one count of aggravated armed robbery after an incident in Mandurah on Wednesday afternoon.
Police will allege the man was armed with a brick when he threatened a 87-year-old male driver of a car parked on Allnutt street.
It will be further alleged the victim got out of the vehicle, fell onto the ground and was extremely shaken by the incident.
Police will allege the man drove away in the victim's car, which was located a short time later at a nearby shopping centre carpark.
The man is due to appear in the Perth Magistrates Court on August 13, 2020.