Oklahoma Loss of Memory (OLD) is a rare neurological disorder characterized by a progressive decline in the ability to recall information and events. It is caused by damage to the hippocampus, the part of the brain that stores memories. OLD can range in severity from mild memory impairment to severe dementia. There are three types of OLD: primary, secondary, and tertiary. Primary OLD is caused by a genetic mutation that affects the production of a protein in the brain that is necessary for long-term memory storage. Secondary OLD is caused by a head injury or stroke, and can result in the permanent loss of memories. Tertiary OLD is caused by Alzheimer’s disease or other dementia-related illnesses, and is associated with a gradual decline in memory. All three types of OLD can cause difficulty in recalling recent events and facts, as well as difficulty in learning new information. Symptoms of OLD can include memory loss, confusion, disorientation, difficulty with language, and difficulty in completing daily tasks. Treatment for OLD is focused on managing symptoms and slowing progression of the disorder.