Boynton Beach Police spokeswoman Stephanie Slater says police called to the scene Sunday found the man standing next to his car and smoking a cigarette in spite of a gunshot wound to the upper left side of his chest.
The man told police he was selling his Cadillac and had taken a potential buyer for a test drive.
According to police, the buyer tried to rob the car's owner at gunpoint.
The owner told police he defended himself with a knife concealed in his cane before he was shot. The buyer fled on foot.
Slater says the Cadillac's owner was hospitalized and expected to live. Police are searching for the gunman.