A 79-year-old livery-cab driver plowed into a pedestrian in Brooklyn on Tuesday, leaving him in critical condition, authorities said.

The 65-year-old victim was in the crosswalk on Nostrand Avenue when the driver struck him while attempting to make a left turn onto Quentin Road around 6 a.m., officials said.

The victim suffered severe head and body trauma and was rushed to Kings County Hospital in critical condition, officials said.

The driver was taken into custody at the scene and is expected to be charged with failure to yield, police said.