James Moten, who suffers from dementia, apparently walked away from his residence at about 6:30 a.m. and has not been seen since, according to Oakland police.
Moten is considered at risk because of his mental condition.
He is described as a black man with a beard, a bald head and brown eyes. He is around 5 feet 2 inches tall and weighs around 140 pounds. He was last seen wearing a white T-shirt and black sweat pants.
Anyone who might have information about the case is asked to contact Oakland police at (510) 238-3641.