Yes, young people can get dementia, though it is rare

Dementia is not a disease of old age alone. People in their 30s, 40s, and 50s can develop dementia, and some cases appear even earlier. When dementia occurs before age 65, it is called early-onset dementia or young-onset dementia. The symptoms are the same as dementia in older adults — memory loss, difficulty with language, problems with judgment — but the experience of having it at a younger age creates different practical problems: you may still be working, raising children, or managing a mortgage when diagnosis happens.

Early-onset dementia accounts for roughly 2 to 10 percent of all dementia cases, depending on the population studied. The actual number of young people living with it is unknown because many go undiagnosed for years. Doctors often miss it because they do not expect to see dementia in a 45-year-old, so symptoms get attributed to stress, depression, or other conditions instead.

Key Takeaways

  • Early-onset dementia can appear in people in their 30s and 40s, though it becomes more common with age.
  • The most common cause in younger people is Alzheimer's disease, followed by frontotemporal dementia and vascular dementia.
  • Diagnosis often takes years because doctors do not routinely screen for dementia in younger adults, so symptoms get misdiagnosed as depression or stress.
  • If you notice persistent memory problems, language difficulties, or personality changes, ask your doctor for a cognitive assessment rather than accepting a mental health diagnosis alone.
  • Young people with dementia face different challenges than older adults, including job loss, caregiving for children, and difficulty finding support groups designed for their age group.

What causes dementia in younger people

The causes of early-onset dementia differ somewhat from those in older adults. Alzheimer's disease is still the most common cause, accounting for roughly half of early-onset cases. But frontotemporal dementia — which damages the front and side parts of the brain — is more common in younger people than in older adults. Vascular dementia, caused by reduced blood flow to the brain, also occurs in younger people, often after stroke or heart disease.

Other causes include Lewy body dementia, Parkinson's disease dementia, and dementia linked to Huntington's disease or other genetic conditions. Some cases are tied to head injury, brain infection, or alcohol-related brain damage. In a small number of younger people, dementia results from a genetic mutation that runs in the family — meaning other relatives may also develop it at a young age.

The point is that early-onset dementia is not one disease. It is a group of different brain conditions that happen to appear before age 65. The cause matters because it affects how fast the disease progresses, which symptoms appear first, and what treatment options exist.

Why diagnosis takes so long in younger people

A person in their 40s who forgets appointments or struggles to find words is more likely to be told they are stressed, depressed, or burned out than to be screened for dementia. Doctors do not routinely test for cognitive decline in younger adults, so early symptoms often get missed or misattributed. Someone might see a therapist for depression, take antidepressants, and still decline cognitively while everyone assumes the real problem is mental health.

This delay matters. The longer dementia goes undiagnosed, the further the disease progresses before treatment begins. Some medications for Alzheimer's disease work better when started earlier. More importantly, an undiagnosed person may make major life decisions — taking on debt, changing jobs, having children — without understanding that their judgment and memory are already affected.

If you notice persistent problems with memory, language, or decision-making that do not improve with rest or stress management, ask your doctor specifically for a cognitive assessment. Use the word "dementia" or "cognitive decline" rather than waiting for your doctor to suggest it. Bring a family member or close friend to the appointment who can describe changes they have noticed, because people with early cognitive decline often do not recognize the problem themselves.

Symptoms that may signal early-onset dementia

Early symptoms vary depending on which type of dementia is developing. In Alzheimer's disease, memory loss usually comes first — forgetting recent conversations, losing track of time, misplacing objects. In frontotemporal dementia, personality and behavior change often appear before memory loss: someone becomes withdrawn, impulsive, or emotionally flat in ways that seem unlike them.

Common early signs across types include difficulty finding words or following conversations, trouble managing money or paying bills, getting lost in familiar places, poor judgment about spending or risk, and mood or personality changes. Some people become withdrawn; others become unusually outgoing or inappropriate. Sleep problems, repetitive behaviors, and loss of interest in activities are also common.

The key is that these changes are noticeable to people who know you well and persist over weeks or months. Occasionally forgetting a name is normal. Consistently struggling to remember the names of close friends, or forgetting conversations that happened yesterday, is not.

How diagnosis works

Diagnosis begins with a detailed history from you and someone who knows you well — a spouse, parent, or close friend who can describe how you have changed. Your doctor will ask about when symptoms started, how they have progressed, and whether anyone in your family has had dementia or neurological disease.

You will then have a cognitive assessment, usually a series of tests that measure memory, language, attention, and reasoning. Common tests include the Montreal Cognitive Assessment (MoCA) and the Mini-Cog. These take 10 to 30 minutes and are done in the office.

If cognitive testing shows decline, your doctor will order brain imaging — usually an MRI or CT scan — to look for physical changes in the brain and rule out other causes like stroke or tumor. Some people also have a PET scan, which can show Alzheimer's-related changes. Blood tests for biomarkers are becoming more common and can detect Alzheimer's disease in earlier stages. Depending on the results, you may be referred to a neurologist or neuropsychologist for more detailed testing.

Living and working with early-onset dementia

A diagnosis of early-onset dementia creates practical problems that older adults with dementia often do not face. You may still have a job, a mortgage, and children who depend on you. You may be the primary earner in your household. Telling your employer, deciding when to stop working, and managing finances become urgent questions.

Some people with early-onset dementia can continue working for years with accommodations — reduced hours, simplified tasks, written instructions, or a quieter workspace. Others decline quickly and need to leave work within months. There is no standard path. Talking to your doctor about what to expect, and consulting with an employment lawyer or disability advocate about your rights, can help you make informed decisions about when and how to disclose your diagnosis.

Caregiving also looks different. If you have children, you may need to arrange care for them while you receive treatment or as your condition progresses. If you have aging parents, you may have expected to care for them — that role may now reverse. Support groups for young-onset dementia exist, though they are less common than groups for older adults, and finding one in your area may require searching online or contacting a dementia organization.

Treatment and support options

Treatment depends on the type of dementia. For Alzheimer's disease, medications like donepezil, rivastigmine, and galantamine can slow cognitive decline in some people, particularly if started early. Lecanemab is a newer drug that may slow decline in early Alzheimer's disease, though it requires regular infusions and monitoring. These medications do not stop dementia or reverse it; they may slow progression by months.

For other types of dementia, treatment is less specific. Frontotemporal dementia has no disease-modifying drugs, though medications can manage behavioral symptoms. Vascular dementia treatment focuses on managing stroke risk through blood pressure control, blood thinners, and lifestyle changes.

Beyond medication, cognitive rehabilitation, speech therapy, and occupational therapy can help you adapt to changes and maintain function longer. A neuropsychologist can work with you on strategies for memory, organization, and decision-making. Mental health support — therapy or counseling — addresses the emotional impact of diagnosis, which is significant at any age but especially when you are still working and raising a family.

Frequently Asked Questions

Is early-onset dementia hereditary?

Some types are, some are not. Familial Alzheimer's disease, caused by specific genetic mutations, runs in families and can appear in people in their 30s and 40s. Frontotemporal dementia also has genetic forms. But most early-onset dementia is not inherited. If dementia runs in your family, genetic counseling can help you understand your risk.

Can stress or depression cause dementia in young people?

No. Stress and depression can cause memory problems and difficulty concentrating, but they do not cause dementia. However, depression is common in people with early dementia, and the two can coexist. If you have depression and memory problems that do not improve with treatment, ask for cognitive testing to rule out dementia.

What should I do if I think I have early-onset dementia?

Start with your primary care doctor and describe specific changes — memory loss, language problems, personality changes — with dates and examples. If your doctor dismisses your concerns, ask for a referral to a neurologist. You can also contact a dementia organization for information about specialists in your area.

Can young people with dementia work?

Some can, for a time, with workplace accommodations. Others decline too quickly to continue. It depends on the type of dementia, how fast it is progressing, and the demands of your job. Talking to your doctor about prognosis and your legal rights as an employee can help you plan.

Where can I find support if I am diagnosed with early-onset dementia?

The Alzheimer's Association and other dementia organizations offer support groups, educational resources, and care planning tools. Some groups are specifically for young-onset dementia. Your neurologist can also refer you to social workers and counselors who specialize in dementia care.