World Alzheimer's Day is observed worldwide every September 21. This day is part of World Alzheimer's Month, which is recognized annually in September by organizations supporting people with dementia. The day aims to increase public awareness of Alzheimer's disease, a prevalent form of dementia that primarily affects memory, thinking, and speech in senior individuals. Notably, Alzheimer's disease is the sixth leading cause of death in the USA among those over 18 and the fifth among those over 65. Events are coordinated by Alzheimer's Disease International and the World Health Organization. A common custom associated with this observance is wearing purple to express support and awareness for those affected by the disease.