After hearing a dementia diagnosis, it’s common to want to understand how far it has progressed. People often ask: what stage are we in? The question is partly a search for a roadmap. It is also a quiet way of asking 'how long do we have?' The honest answer is more useful than the simple one — and it begins with what the stages actually describe.
This guide walks through the most commonly used dementia-staging frameworks, what each is good at, what they cannot tell you, and how to use stages without letting the label run the day-to-day. Plain language. Built from the questions families ask in the parking lot after the neurology visit.
TL;DR: Three frameworks are in common use to stage dementia: the seven-stage Global Deterioration Scale (GDS / Reisberg), the three-stage early-middle-late shorthand most families and the Alzheimer's Association use, and the Functional Assessment Staging Tool (FAST). All three describe averages, not destinies. People with dementia move through stages at very different speeds, sometimes skipping or repeating. Stages are useful for orienting the next six months — not for predicting the next six years.
Why stages exist at all
Staging frameworks were built to help clinicians, researchers, and families share a common vocabulary. Before stages, every dementia conversation started from scratch. Stages let a neurologist, a hospice nurse, and a long-distance sibling all use the same shorthand — 'middle stage,' 'GDS 5,' 'FAST 6a' — and have it mean roughly the same thing.
Stages are descriptive, not prescriptive. They describe what people on average are doing at this point in the disease — if they’re forgetting common words, which daily care areas they tend to need help with, which physical changes tend to surface. They do not predict when an individual person will move from one stage to the next.
The three-stage shorthand (early, middle, late)
Most families end up using the three-stage shorthand — early, middle, late. Early stage usually means the diagnosis is real and visible, but the parent can still manage many of their own care needs, with prompts and routines. Middle stage usually means the parent needs help with several activities of daily living - like bathing reminders, reminders to change clothing, help making meals, medication management - as well as supervision through the day. Late stage usually means the parent needs help with most or all daily activities and significant physical changes like changes to balance, walking independently, or vision changes, are surfacing.
The three-stage version is the one the Alzheimer's Association uses for most family-facing materials. It is the least precise but the most useful in conversation. When the neurologist says 'middle stage,' families can usually picture what that looks like at home.
The seven-stage Reisberg scale (GDS)
The Global Deterioration Scale, sometimes called the Reisberg scale, divides the course of Alzheimer's into seven stages: no impairment, very mild decline, mild decline (early), moderate decline (mild-to-moderate), moderately severe (middle), severe (middle-to-late), and very severe (late). Stages 4 through 7 are the ones where families spend the most time managing day-to-day care.
GDS is widely used in clinical and research settings and is the framework most hospice agencies map to. The companion FAST (Functional Assessment Staging Tool) breaks stage 6 and 7 into sub-stages (6a, 6b, 6c, 6d, 6e, 7a, 7b, 7c, 7d, 7e, 7f) — these sub-stages are how hospice determines hospice eligibility for Alzheimer's patients. If a family is being told about hospice, FAST may be the framework underneath the conversation.
What stages do not tell you
Stages do not predict timing. Some people move from early stage dementia to middle stage dementia in twelve months; others stay in early stage for five years. Stages do not predict which symptoms will be the hardest for a particular family. Stages do not capture good days vs. bad days — a parent at GDS 5 can have a clear afternoon that looks like GDS 3 and a foggy evening that looks like GDS 6.
Stages also do not capture the experience. The most useful sentence about staging that any family hears is the one the social worker said when the family asked which stage Mom was in: 'we are in the stage of needing to plan for the next six months, and the next six months will tell us about the six after that.' That framing is honest about what the labels can and cannot do.
How to use stages without being run by them
The most useful stage-based question is not 'what stage are we in?' It is 'what is changing this month that was not changing six months ago?' That question maps to whichever framework the clinician uses, but it also gives the family a window into what to plan for next. The same question, asked monthly, is how a family stays oriented through years of slow change.
- Pick one framework and stay with itSwitching between GDS and the three-stage shorthand makes the family conversation noisier. Most families do best with the three-stage version.
- Track functional changes, not test scoresWhat can your parent do this month that was harder six months ago — or vice versa? Function changes are what stages describe. A single MMSE score is a snapshot, not a stage.
- Plan one stage ahead, not threeTrying to plan for late-stage care from early stage is exhausting and may not be accurate. Plan for the next stage, with the next stage's resources, and revisit every six months.
- Keep a one-page running summaryDate the entries. Sleep, eating, mood, mobility, recognition, words, continence. Six lines a month becomes a real record by year's end.
- Ask the clinician for the framework they preferSome neurologists default to GDS, some to FAST, some to three-stage. Ask which one, then ask them to tell you each visit.
- Beware the stage-as-fortune-teller temptationStages are not horoscopes. Reading the description of stage 6 when your parent is in stage 4 will not prepare you — it will mostly upset you.
Stages do not capture the day-to-day swings that often define Lewy body dementia in particular — and the type of dementia matters more than the stage for the medication conversation. For the type-by-type primer, see Alzheimer's, vascular, Lewy body, frontotemporal: how to tell them apart. For the broader first-month playbook this conversation feeds into, see The First 30 Days After a Dementia Diagnosis. For the longer pillar of related guides, the Dementia & Alzheimer's hub has the full set, including When is it time for memory care? — the stage-and-setting conversation that often follows.
A note on what helps: Aging Sidekick can help you turn a year of small observations into a one-page summary you can hand to the neurologist, the hospice nurse, or a sibling — built from a fifteen-minute voice intake. Free to start. We complement, not replace, your healthcare team.
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