Alzheimer's disease stages What changes at each one, and when to act

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The Alzheimer's Association describes Alzheimer's in three stages: early, middle and late. The National Institute on Aging counts four, with a preclinical stage before symptoms. Stages overlap and are hard to assign, so plan around the change you can see.

A diagnosis arrives with a name attached and almost no schedule attached. Families leave the appointment knowing what the disease is called. They still do not know what next spring looks like, or which decisions have a deadline on them. The stage frameworks below are the closest thing to a schedule the major sources publish. They are looser than the numbers make them sound.

The Alzheimer's Association's stages page states that Alzheimer's "typically progresses slowly in three stages: early, middle and late (sometimes referred to as mild, moderate and severe in a medical context)." The National Institute on Aging counts differently. In What Are the Signs of Alzheimer's Disease? it names four clinical stages: preclinical, mild, moderate and severe. Both are describing the same disease. The numbering is a convention, and different conventions are in circulation.

The Alzheimer's Association's Facts and Figures report estimates that 7.4 million Americans age 65 and older are living with Alzheimer's in 2026. About 1 in 9 people in that age group has it. Most of those families are working out the sequence as they go.

Stage numbers come from three different scales

Families are handed a number by a neurologist, a facility intake form, or a search result, and the number rarely arrives with the name of the scale it came from. A 2023 Fast Fact in the Journal of Palliative Medicine, Anticipatory Guidance in Dementia Across the Stages, sets out the two clinical scales in ordinary use. It says "the most common clinical scales are the Global Deterioration Scale (GDS) and the Functional Assessment Stage Test (FAST)," and that higher scores mean worse function or cognition.

The same Fast Fact describes the GDS as "a 7-stage scale of cognitive deterioration for those suffering from a primary degenerative dementia such as Alzheimer's disease." It describes the FAST scale as a tracker of functional status, covering instrumental activities of daily living such as managing finances or driving, and activities of daily living such as hygiene, dressing and feeding. Its staging table lines the two scales up against the plain-English stages. Mild or early stage is GDS 4 and FAST 3 to 4, moderate or middle stage is GDS 5 to 6 and FAST 5 to 6, and severe or end stage is GDS 7 and FAST 6 to 7. A parent described as "stage 6" therefore sits in two places on that table. GDS 6 is the middle stage. FAST 6 straddles the middle and the severe stage. Ask which scale the number came from.

The Alzheimer's Association attaches a caution to its own three stages that is worth carrying into every conversation about a number: "Be aware that it may be difficult to place a person with Alzheimer's in a specific stage as stages may overlap." Its page also says the stages "provide an overall idea of how abilities change once symptoms appear and should only be used as a general guide."

The stage number is mostly built for clinicians, researchers and intake staff. What a family can plan around is the specific change: the bill that did not get paid, the route that got lost, the bath that now needs two people. The rest of this guide is organized on the three-stage frame the Alzheimer's Association uses. The National Institute on Aging's symptom lists sit inside each one.

Early-stage Alzheimer's: independent, with gaps that show

In the early stage, according to the Alzheimer's Association, a person "may function independently. He or she may still drive, work and be part of social activities," while feeling as though memory is slipping. The Association lists six common difficulties. Three of them are coming up with the right word or name, remembering names when introduced to new people, and having difficulty performing tasks in social or work settings. The other three are forgetting material that was just read, losing or misplacing a valuable object, and experiencing increased trouble with planning or organizing.

The National Institute on Aging's list for mild Alzheimer's overlaps, and adds items families often put down to personality. The first four are poor judgment leading to bad decisions, loss of spontaneity and sense of initiative, taking longer to complete normal daily tasks, and trouble handling money and paying bills. It also names wandering and getting lost, mood and personality changes, and increased anxiety and/or aggression. NIA notes that "Alzheimer's is often diagnosed at this stage." That page was content reviewed in October 2022.

The Journal of Palliative Medicine Fast Fact characterizes people at this stage as "mainly independent but begin to make mistakes in IADLs." It adds that "they may withdraw from social situations and deny issues" and that "they often retain decision-making capacity at this stage." That last clause has a deadline attached to it.

You may still be working out whether this is Alzheimer's or another form of dementia. Our guide to the difference between dementia and Alzheimer's covers how the terms relate.

Legal paperwork belongs in the early stage

Alzheimers.gov, the National Institute on Aging's public information site, is direct about the sequencing. On financial directives it says: "These must be created while the person still has the legal capacity to make decisions." The three documents it names are a will, a durable power of attorney for finances, and a living trust. On the health care side it names a living will and a durable power of attorney for health care. The second of those "names someone as a 'proxy' to make medical decisions for you when you are not able." The page was last updated January 21, 2026.

The same Fast Fact puts those items on its early-stage list: identify surrogate decision makers and include them in discussions, and complete advance directives and discuss the use of an elder care lawyer. It also lists discussing future care preferences such as hospitalizations or code status. It puts driving in the early-stage bucket, alongside gun safety and medication adherence.

Driving is the conversation families postpone hardest. The Alzheimer's Association's page on dementia and driving states that "a person living with Alzheimer's will, at some point, be unable to drive." It suggests planning the handover before it becomes urgent. Two of its specific suggestions are usable now. Ask the physician to write a letter or prescription stating that the person must not drive, so the decision has a document behind it, and while the person is still in the early stage, ask them to sign a driving contract giving you permission to help them stop when the time comes. The Association also says to expect the person to become angry, "due to the memory and insight issues that are part of Alzheimer's." It adds that this may be the first of many conversations.

Middle-stage Alzheimer's is usually the longest stretch

The Alzheimer's Association describes middle-stage Alzheimer's as "typically the longest stage" and says it "can last for many years." The symptoms it lists run long: being forgetful of events or personal history, feeling moody or withdrawn in socially or mentally challenging situations, and being unable to recall an address or telephone number. It also names confusion about where they are or what day it is, needing help choosing proper clothing for the season, and trouble controlling bladder and bowels. The list closes with changes in sleep patterns, including daytime sleeping and nighttime restlessness, an increased tendency to wander and become lost, and personality changes including suspiciousness, delusions, or repetitive behavior such as hand-wringing.

The NIA moderate-stage list runs parallel, and includes several items families do not anticipate: shortened attention span, problems coping with new situations, and difficulty carrying out familiar, multistep tasks such as getting dressed. It also names occasional problems recognizing family and friends, hallucinations, delusions and paranoia, and impulsive behavior. One item on it is restlessness, agitation, anxiety, tearfulness and wandering, especially in the late afternoon or evening. That late-day pattern has a name and a literature of its own. Our guide to sundowning and late-day dementia behavior covers what helps.

The Journal of Palliative Medicine Fast Fact says that at this stage "IADLs and ADLs issues emerge," that people "may get lost in familiar places, not recognize family members, and experience irritability, agitation, and sundowning," and that the surrogate decision maker takes on more of the health care decisions. Its middle-stage guidance is to explore living arrangements early. The options it names are transition from home to a facility, in-home care, adult day centers and respite care. The Alzheimer's Association makes the same point on its stages page, suggesting respite care or an adult day center so caregivers can take a break while the person continues to receive care in a safe environment.

Wandering sits in this section because both symptom lists put an increased tendency to wander in the middle stage. That placement is wrong in an important way, and the Association's own material says so. Its page on wandering states that wandering "can happen at any stage of the disease." It says that "six in 10 people living with dementia will wander at least once," and that "everyone living with Alzheimer's or other dementia is at risk for wandering."

The Association's own risk-reduction list is concrete and cheap to act on. Place deadbolts out of the line of sight, high or low, on exterior doors. Install warning bells above doors, or use a monitoring device that signals when a door is opened. Place a pressure-sensitive mat in front of the door or at the bedside. Store coats, hats, keys and wallets out of sight, because they can trigger the instinct to leave. It also says these actions cannot guarantee that a person will not wander, and that a person with dementia should never be locked in at home.

The Association's own instruction for the moment someone goes missing is specific. It is the one line on this page worth memorizing. Begin search efforts immediately. Look first within about 1.5 miles of where the person disappeared, because many are found there. If the person is not found within 15 minutes, call 911 to file a missing person's report and tell the authorities that the person has dementia. It also suggests keeping a recent close-up photo on hand to give to police, and listing in advance the places the person might head for, such as past jobs, former homes or a place of worship. If a door sensor is the piece you are missing, our overview of home monitoring options for seniors covers what these devices do and where the privacy lines sit.

Where stage numbers stop helping

A fall or a hospital stay can skip stages

The Journal of Palliative Medicine Fast Fact notes that "sentinel events such as a fall with fracture or a hospitalization may cause a precipitous decline leading to skipped stages." Families who have built a plan around a slow, ordered progression can find themselves two stages further along after one bad week. This is one reason the Fast Fact recommends anticipatory guidance early and recurrently, ahead of the point of need.

These scales describe Alzheimer's, and other dementias move differently

The Global Deterioration Scale was built, in the Fast Fact's words, for "a primary degenerative dementia such as Alzheimer's disease." The staging table in it is titled for Alzheimer's specifically. A parent with Lewy body dementia or vascular dementia can be staged on the same scales, and will not necessarily follow the same order of losses. Our guide to Lewy body dementia covers how that diagnosis differs. Where a diagnosis is mixed or unclear, ask the clinician which scale the number came from.

Late-stage Alzheimer's turns the work into comfort and body care

The Alzheimer's Association describes the final stage as one where "individuals lose the ability to respond to their environment, to carry on a conversation and, eventually, to control movement," and where "they may still say words or phrases, but communicating pain becomes difficult." Its list for this stage has five items: around-the-clock assistance with daily personal care, loss of awareness of recent experiences and surroundings, changes in walking, sitting and eventually swallowing, difficulty communicating, and vulnerability to infections, especially pneumonia.

The NIA severe-stage description is blunter: people "cannot communicate and are completely dependent on others for their care," and near the end of life a person "may be in bed most or all of the time as their body shuts down." Its symptom list adds weight loss with little interest in eating, seizures, and general physical decline including dental, skin and foot problems. It also lists difficulty swallowing, groaning or moaning, increased sleeping, and loss of bowel and bladder control. NIA names aspiration pneumonia as a common cause of death, describing it as pneumonia that "develops when a person cannot swallow properly and takes food or liquids into the lungs instead of air."

Much of the late-stage caregiving load is physical. The Alzheimer's Association's late-stage caregiving guidance is specific about it. On skin and body health it says a person can become bedridden or chair-bound, which "can cause skin breakdown, pressure sores and 'freezing' of joints." It advises changing the person's position at least every two hours to relieve pressure and improve blood circulation, washing with mild soap and blotting dry because skin tears and bruises easily, and checking daily for rashes, sores or breakdowns. On eating it suggests keeping the person upright for 30 minutes after eating to aid digestion, choosing soft foods, thickening liquids, and alternating small bites with fluids. Range-of-motion exercises to prevent joint freezing come with the Association's own instruction to consult the doctor before starting them.

On feeding decisions the Journal of Palliative Medicine Fast Fact reports the clinical guidance as recommending careful hand feeding over medically administered nutrition and hydration, and it lists distinguishing reversible causes of poor intake from causes related to disease progression as part of the same conversation. That is a decision for the treating clinicians and the family together. It is one of the reasons the advance directive written in the early stage earns its keep years later.

How long does Alzheimer's last?

Published estimates do not agree. The Alzheimer's Association's Facts and Figures report states that "people age 65 and older survive an average of four to eight years after a diagnosis of Alzheimer's, yet some live as long as 20 years with Alzheimer's." It attributes that spread to "the slow, insidious and uncertain progression of the disease." The same four-to-eight-years figure appears on its stages page. The 2023 Journal of Palliative Medicine Fast Fact gives a different central estimate, putting median life expectancy at about 7 to 10 years from diagnosis.

Per-stage figures are looser still. The Fast Fact's staging table gives approximately 2 to 4 years for the mild stage, approximately 2 to 5 years for the moderate stage, and approximately 1 to 3 years for the severe stage. It presents all three as approximations. Neither the Alzheimer's Association's stages page nor NIA's signs page states how long an individual stage lasts at all. The Association will say only that the middle stage is typically the longest and can last for many years.

What follows from that, practically, is a posture toward planning. The Alzheimer's Association's own published span runs from four years to twenty. A family that arranges finances and care for the top of that span, and needs the bottom, ends up with arrangements it never used. A family that arranges for the bottom and needs the top runs out of money, or out of the caregiver, partway through. The Fast Fact's own recommendation is to provide anticipatory guidance early and recurrently. For a family that means revisiting the plan on a calendar rather than when something breaks.

Hospice turns on a doctor's certification

Hospice eligibility is one of the few places in this article where a hard rule exists, and it is not written in stages. Medicare.gov states that you must have Medicare Part A and meet three conditions. The first: "Your hospice doctor and your regular doctor (if you have one) certify that you're terminally ill (with a life expectancy of 6 months or less)." The second and third are accepting "comfort care (palliative care) instead of care to cure your illness and related conditions," and signing a statement choosing hospice care instead of other Medicare-covered treatments for the terminal illness and related conditions. Medicare also states that after six months, hospice care can continue as long as the hospice medical director or hospice doctor recertifies, after a face-to-face meeting, that the person is still terminally ill.

The Alzheimer's Association states the same requirement in its late-stage guidance. It says that "to qualify for hospice benefits under Medicare, a physician must diagnosis the person with Alzheimer's disease as having less than six months to live." It describes hospice as focused on comfort, care and support for people with terminal illnesses and their families.

The Journal of Palliative Medicine Fast Fact adds the detail that turns this from a stage question into a clinical one. It says a FAST score of 7(a to e) is the suggested criterion for Medicare hospice eligibility, describing someone unable to communicate more than a few words, confined to a wheelchair or bed, and incontinent of bladder and bowel. It then says plainly that "this criterion is not the only determination of a prognosis of 6 months or less." A person with lower FAST scores can qualify with relevant comorbidities, frequent hospitalizations, or swallowing problems leading to aspiration. A family told that a parent is "not far enough along" for hospice has grounds to ask which prognostication the clinician is using.