What is the most common age for Alzheimer's to begin?
About 1 in 9 people aged 65 and older has Alzheimer's disease, making it the most common form of dementia among older adults. For the majority of cases, the most common age for Alzheimer's to begin is in a person's mid-60s or later, which is classified as late-onset Alzheimer's. However, a less common form, called early-onset Alzheimer's, can begin much earlier in life, sometimes as early as a person's 30s.