Roughly 7 million Americans age 65 and older are living with dementia today, with estimates reaching 7.4 million with Alzheimer’s alone by 2026, according to the Alzheimer’s Association. When younger adults with early-onset forms are included, the total climbs further. That number is expected to keep rising as the U.S. population ages.
The Current Numbers
Two major estimates help frame the picture. The Alzheimer’s Association projects 7.4 million Americans age 65 and older living with Alzheimer’s disease in 2026. A separate analysis from USC Schaeffer estimates 5.6 million people living with dementia in 2025, with 5.0 million of them age 65 or older. The gap between these figures comes down to methodology: different studies use different diagnostic criteria, data sources, and definitions of what counts as dementia versus mild cognitive impairment.
Alzheimer’s disease is the most common form, accounting for the majority of all dementia cases. Other types include vascular dementia (often caused by reduced blood flow to the brain after strokes), Lewy body dementia, and frontotemporal dementia. Many people have mixed dementia, where more than one type is present at the same time.
Risk Rises Sharply With Age
Dementia is not a normal part of aging, but age is by far the strongest risk factor. CDC data from 2022 shows how steeply the numbers climb:
- Ages 65 to 74: 1.7% have a dementia diagnosis
- Ages 75 to 84: 5.7%
- Age 85 and older: 13.1%
That means roughly 1 in 60 people in their late 60s and early 70s has dementia, compared to about 1 in 8 people age 85 and up. Because the 85-plus population is the fastest-growing age group in the country, total dementia cases are projected to increase significantly over the next two decades even if the per-person risk stays flat.
Early-onset dementia, diagnosed before age 65, is far less common but still affects hundreds of thousands of Americans. These cases often involve different underlying causes and can be harder to recognize because doctors aren’t looking for dementia in a 50-year-old.
Many Cases Go Undiagnosed
The official numbers almost certainly undercount the true burden. Research from the University of Michigan School of Public Health has found that millions of dementia cases go undiagnosed and untreated. Barriers exist at every level: patients may dismiss early symptoms as normal aging, primary care doctors have limited time for cognitive screening, and the healthcare system lacks standardized protocols for early detection. This means a significant share of people living with dementia have never received a formal diagnosis, and neither they nor their families have access to the support and planning that a diagnosis can set in motion.
Racial and Ethnic Disparities
Dementia does not affect all communities equally. CDC data on self-reported cognitive decline, an early marker that often precedes a dementia diagnosis, shows notable differences across racial and ethnic groups. Among adults 45 and older, American Indian and Alaska Native adults reported the highest rates at 16.7%, followed by Hispanic adults at 11.4%, Black adults at 10.1%, and White adults at 9.3%. Asian and Pacific Islander adults reported the lowest rate at 5.0%.
These disparities reflect a mix of factors: higher rates of cardiovascular disease and diabetes in some communities, unequal access to healthcare, differences in education and economic opportunity, and the long-term health effects of systemic racism and chronic stress. Importantly, disparities in diagnosis also play a role. Communities with less access to specialty care may have both more undiagnosed cases and fewer opportunities for early intervention.
The Cost of Care
Dementia is one of the most expensive conditions in the country to manage, in large part because it eventually requires round-the-clock supervision. Unlike a heart attack or a broken bone, dementia unfolds over years, and the care needs intensify gradually. Someone in the early stages might need help remembering medications, while someone in later stages may need assistance eating, bathing, and navigating their own home.
Much of that care falls on family members. Over 53 million Americans serve as unpaid caregivers for older adults or people with chronic conditions, and dementia caregiving is among the most demanding forms. Nearly one-third of all unpaid caregivers provide 20 or more hours of care per week. For dementia specifically, the time commitment is often much higher, and caregivers face elevated rates of depression, anxiety, and physical health problems themselves. The number of unpaid caregivers in the U.S. jumped from 43.5 million in 2015 to roughly 53 million by 2020, a trend driven partly by the aging population.
Why the Numbers Keep Growing
The single biggest reason dementia cases are rising is demographic. Baby boomers, the largest generation in American history, are now moving into the age range where dementia becomes common. Every day, roughly 10,000 Americans turn 65. As this wave of aging continues through the 2030s and 2040s, the number of people living with dementia is expected to climb substantially, potentially doubling within a generation.
There are some countervailing trends. Age-specific dementia rates have actually declined slightly over the past few decades, likely because of improvements in cardiovascular health, higher education levels, and better management of conditions like high blood pressure and diabetes. But those gains are not enough to offset the sheer number of people reaching advanced age. The total count of Americans with dementia will continue to grow for the foreseeable future, placing increasing pressure on families, healthcare systems, and public spending.