A family guide
The 7 Stages of Dementia
The Reisberg Global Deterioration Scale divides Alzheimer's progression into 7 stages. It's the most widely-used framework for understanding what's coming next — what to expect, what to plan for, and when each level of care typically becomes appropriate.
This guide walks through each stage in plain language, with typical duration, what to watch for, and what care looks like. Plus how Lewy body, vascular, and frontotemporal dementia differ from the standard Alzheimer's progression.
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The 7 Reisberg stages
Stage 1: No cognitive impairment
Duration: Decades (this is most of life).
What it looks like: Normal cognition. No symptoms.
Care needed: None.
Stage 2: Very mild cognitive decline
Duration: Variable, can be many years.
What it looks like: Misplacing items. Forgetting names occasionally. The kind of forgetfulness most older adults experience as normal aging. Family doesn't notice; the senior may notice themselves.
Care needed: None beyond annual health checks. This stage may not even be early dementia — many adults at Stage 2 never progress further.
Stage 3: Mild cognitive decline (MCI)
Duration: 2-7 years.
What it looks like: Now OTHERS start to notice. Difficulty finding words, asking the same question twice in a conversation, getting lost in familiar places, trouble at work that's new. This is often when family raises the "is something wrong?" question.
Care needed: Doctor evaluation. Cognitive screening (MoCA). Rule out reversible causes (B12, thyroid, depression). Begin POA + advance directive planning while capacity is intact. Daily check-in service helps catch changes.
Stage 4: Moderate cognitive decline (early dementia)
Duration: About 2 years.
What it looks like: Diagnostic stage. Difficulty with complex tasks (paying bills, planning meals, managing medications). Memory of recent events fades. Withdrawal from work or social activities. Repeating stories within a conversation.
Care needed: Medical workup. Begin FDA-approved treatments (Aricept, Leqembi if eligible). Set up POA. Stop driving evaluations. Daily companion calls + medication reminders. Family alerts. Digital Vault for documents.
Stage 5: Moderately severe cognitive decline
Duration: About 1.5 years.
What it looks like: Significant memory gaps. May forget address, phone number, current weather. Struggles with choosing clothes appropriate for season. Needs help with daily tasks (dressing, bathing assistance). Still typically knows their own name, family member names.
Care needed: Part-time home aide visits 2-5x/week. Continued daily check-in calls. Memory care evaluation (decision point, but not always needed yet). Home modifications: door alarms, locked medication, simplified routines.
Stage 6: Severe cognitive decline (moderately severe dementia)
Duration: 2-3 years.
What it looks like: Major personality changes (paranoia, hallucinations, anxiety). Sundowning common. Incontinence emerges. May not recognize close family members. Wandering risk. Needs hands-on help with most daily tasks. Sleep disruption.
Care needed: Memory care facility OR full-time in-home aides (24/7 if living alone). Active management of behavioral symptoms. Hospice referral discussion (in advanced stage 6). Family caregiver support is critical at this stage.
Stage 7: Very severe cognitive decline (late-stage dementia)
Duration: 1-3 years.
What it looks like: Loss of speech (limited to a few words or none). Inability to walk or sit without help. Swallowing difficulties. Full incontinence. Most time in bed. Pneumonia and infection risk high.
Care needed: Hospice care. Comfort-focused. Family support for grief + end-of-life decisions. Daily comfort care from trained staff or family.
How long from diagnosis to death?
Average lifespan from Stage 3-4 (typical diagnosis point) to Stage 7 end-of-life:
- Alzheimer's disease: 8-10 years (average)
- Vascular dementia: 5-7 years (faster, often stepwise after strokes)
- Lewy body dementia: 5-8 years
- Frontotemporal dementia: 6-8 years (younger-onset, faster in some forms)
- Mixed dementia: Variable
Individual variation is enormous. Some patients live 20+ years from diagnosis; others progress through all 7 stages in 3-5 years. Genetics, comorbid conditions, age at onset, and care quality all matter.
How close are we to a cure for dementia?
There is no cure for most forms of dementia as of 2026, but treatment has improved meaningfully in the last 3 years. Lecanemab (Leqembi), FDA-approved in 2023, and donanemab (Kisunla), approved in 2024, are the first medications shown to modestly slow Alzheimer's progression in early stages by clearing the amyloid plaques associated with the disease. They don't reverse damage that's already happened — but they may add 6-18 months of higher-functioning time when started early.
Several other anti-amyloid and anti-tau therapies are in late-stage clinical trials. For vascular dementia, aggressive blood pressure and cholesterol control can meaningfully slow progression — making it the most modifiable form. For Lewy body, frontotemporal, and other types, treatments remain supportive (managing symptoms, not stopping disease).
The honest picture: a true cure is likely still 10-20+ years away. But for newly-diagnosed patients in 2026, treatment options exist that didn't three years ago. Talk to a memory disorders specialist about whether your parent qualifies.
How the other dementia types differ from the standard 7 stages
Lewy body dementia stages
Lewy body dementia (LBD) doesn't fit neatly into the Reisberg scale. Distinct features:
- Visual hallucinations EARLY (often Stage 3 equivalent)
- REM sleep behavior disorder (acting out dreams) often precedes other symptoms by years
- Fluctuating clarity — patient can have lucid days and confused days
- Parkinsonism (tremor, rigidity, slow movement)
- Extreme sensitivity to antipsychotic medications — caution required
LBD families need a specialist neurologist familiar with the condition. Medications that help Alzheimer's may worsen LBD.
Vascular dementia stages
Vascular dementia often progresses in "stepwise" decline rather than gradually:
- Sudden noticeable decline after a stroke or TIA
- Plateau for months or years
- Another decline after another vascular event
- Balance and gait often impaired early (more than Alzheimer's)
- Executive function + judgment hit hard early
- Memory may be preserved relatively longer than Alzheimer's
Aggressive blood pressure + cholesterol control can SLOW vascular dementia. This is the most modifiable form.
Frontotemporal dementia (FTD) symptoms + progression
FTD primarily affects younger adults (40-65). Personality and behavior changes come BEFORE memory loss:
- Disinhibition, socially inappropriate behavior
- Apathy or compulsive behaviors
- Poor judgment about money or relationships
- Language problems (semantic variant FTD)
- Memory often INTACT in early stages
Often misdiagnosed as midlife crisis, depression, or marital problems for years. See our signs of early-onset dementia guide.
How Call Mabel fits across the stages
Mabel is most useful in stages 3-5 (early to moderate dementia) when daily structure + medication adherence + family awareness make the biggest difference. Daily check-ins, medication reminders, distress detection, and a family summary at noon.
In stage 6+, Mabel's daily call may still provide a familiar voice but the senior's ability to engage decreases. By late stage 6 or stage 7, families typically need in-person care (memory care or 24/7 home aides) more than phone-based support.
Frequently asked questions
What does stage 1 dementia look like?
Stage 1 on the Reisberg scale is "no cognitive impairment" — meaning normal cognition with no detectable symptoms. Everyone is at Stage 1 for most of their life. There is nothing for a family to notice or worry about at Stage 1. If you're seeing forgetfulness, word-finding issues, or repeated questions, you're looking at Stage 2 or 3, not Stage 1. Stage 2 (very mild) is the kind of forgetfulness most older adults experience (losing keys, forgetting names). Stage 3 (mild cognitive decline) is when family typically first notices something is wrong. Many adults at Stage 2 never progress to dementia.
What happens right before a dementia patient dies?
In the final days or weeks of advanced (Stage 7) dementia, families typically notice: dramatic reduction in food and water intake (the body is shutting down — this is not starvation and is not painful), increasing time sleeping or unresponsive, breathing changes (irregular pauses, "death rattle" from secretions in the throat), cooling and mottling of the hands and feet, restlessness or terminal agitation in some patients, and loss of swallow reflex. Hospice nurses are excellent at recognizing these signs and helping families prepare. Most dementia deaths are ultimately caused by pneumonia (from aspiration or immobility) or sepsis. The active dying phase usually lasts 1-3 days.
What happens when a dementia patient becomes unresponsive?
Unresponsiveness in late-stage dementia can mean several things and isn't always end-of-life. Causes include: progression into Stage 7 (loss of awareness is gradual but expected), infection (UTI, pneumonia — often reversible if caught), medication side effects (especially sedatives or new prescriptions), dehydration, stroke, or active dying phase. If unresponsiveness is sudden, call the doctor or hospice — infection or medication adjustment may help. If it's gradual and the patient is on hospice, it's usually the body shutting down. Continue talking gently to them; hearing is believed to be the last sense to fade. Comfort care (mouth swabs, repositioning, soft music, family presence) matters more than medical intervention at this point.