The incident happened in the Westhill shopping centre car park at about 11:30 and involved a black Audi A3 driven by a 37-year-old man.
The pensioner, who had been crossing the road, was taken to Aberdeen Royal Infirmary.
Police appealed for anyone who witnessed the accident, or saw the car or pensioner, to contact them.
An 81-year-old man is being treated for life-threatening injuries after being hit by a car in Aberdeenshire.