Robert "Bob" Lewis Murphy is considered an endangered missing person, Cottage Grove Police said.
A healthcare provider told police Murphy left home Thursday by taxi, bound for the Greyhound station in downtown Eugene.
His whereabouts since then are unknown, although he may have been bound for Grants Pass, police said.
Murphy did not take his daily medications with him, police said.
Murphy is 5-foot-8, 150 pounds with blue and bleached blond hair. He may be wearing white pants and a blue jacket.
If you have any information, you are asked to contact Officer Tami Howell with the Cottage Grove Police Department at (541) 942-9145.