According to police, Punnusamyhas a range of health issues that make him vulnerable, including the onset of dementia, high blood pressure and diabetes.
Police set up a command post Tuesday in a hydro field on the west side of Midland Avenue, north of Romulus Drive to search for the missing man.
Punnusamyis described as standing five-foot-five, weighing around 185 pounds, with a heavy build, grey receding hair, and a goatee. He was last seen wearing grey track pants, a blue fleece jacket, and a white sweater.
Police say he walks with a distinctive shuffle and has hip and knee problems that require him to rest frequently.
Police are asking homeowners to check their properties, including backyards, sheds and garages.
Anyone with information is asked to contact police at 416-808-4100 or Crime Stoppers at 416-222-TIPS (8477).