Marion Wells was last spotted at about 11:30 a.m. He is believed to be wearing a red and black jacket, black and brown shirt, black pants and red shoes.
Authorities said he's likely on foot.
Wells suffers from medical conditions and may become disoriented, according to the CHP.
He is described as being 5 feet 6 inches tall, 145 pounds, with gray hair and brown eyes.
If you see Wells, you're urged to call 911.