Senior Care Authority, a firm that advises families on senior care decisions, has built its Alzheimer's and Brain Awareness Month campaign around a figure from the 2024 Lancet Commission on Dementia Prevention, Intervention, and Care: roughly 45% of dementia cases are potentially preventable by addressing modifiable risk factors across a person's lifespan. The Commission named physical inactivity, poor cardiovascular health, untreated diabetes, social isolation and poor sleep among the meaningful contributors to risk.
The framing matters because it pushes back on two widespread assumptions - that Alzheimer's is simply what happens if you live long enough, and that genes settle the question. Neither holds up against the current evidence base. The scale of the problem is not in dispute: the Alzheimer's Association's 2026 Alzheimer's Disease Facts and Figures report counts an estimated 7.4 million Americans aged 65 and older living with the disease, a number projected to approach 13 million by 2050.
The same report exposes a striking knowledge gap. Ninety-nine percent of adults surveyed said brain health is as important as physical health, but only 9% said they knew enough about how to maintain it. That mismatch is essentially the reason the campaign exists. Senior Care Authority says it tracks work from the Alzheimer's Association, the National Institutes of Health, and peer-reviewed journals including The Lancet and Nature Medicine, and that families it works with routinely say they wish they had understood their options earlier.
Prevention research of this kind describes population-level risk, not individual destiny, and the Lancet figure refers to cases that are potentially preventable rather than guaranteed to be avoided. Still, the list of risk factors involved points toward areas - cardiovascular health, metabolic disease, sleep, social connection - that are already the subject of routine medical attention, which is what makes the findings usable rather than abstract.