A doctor named Alois Alzheimer...
Alzheimer's disease was named after German psychiatrist and neuropathologist Aloïs Alzheimer (1864-1915) who first studied it at the start of the 20th century.
In 1901, he studied the case of Auguste Deter, a 51 years old woman experiencing memory and speech troubles, among other problems. The case was familiar for Dr. Alzheimer who previsouly faced dementia, but not for patients as young.
Dr. Alzheimer followed the case of this patients for 5 years until she passed away. He then performed a brain autopsy to discover two abnormalitie that will become the landmarks of this disease: amyloid plaques and neurofibrillary tangles