Alzheimer's Life Expectancy Calculator
Understand the statistical life expectancy after an Alzheimer's disease diagnosis. Enter the age at diagnosis and sex to see the median survival time and typical range, drawn from published longitudinal cohort studies. This tool is for educational reference — individual outcomes vary greatly.
years
Sex
Population median — half of people diagnosed at this age survive longer, half shorter
- 1
Base median survival (age band)
5.5 yrPopulation cohort median for patients diagnosed at age 75. - 2
Sex adjustment
0.5 yrFemale +0.5 yr, other +0.25 yr, male 0 yr (published cohort average). - 3
Median survival after diagnosis
5.5 + 0.5 = 6
How does this calculator work?
Median survival after Alzheimer's diagnosis ranges from about 10 years (diagnosed in early 60s) to 2–3 years (diagnosed after 90), based on published cohort studies. Women tend to survive 0.5–1 year longer than men. These are population statistics — individual outcomes depend on disease stage, health, care, and genetics. Always consult a specialist for personal prognosis.
Formula
How this is calculated
Several landmark cohort studies have tracked survival from Alzheimer's disease diagnosis. Larson et al. (2004, NEJM) followed a community cohort of 521 newly diagnosed patients and found that median survival fell sharply with increasing age at diagnosis: from about 8.3 years for those diagnosed in their 60s, to 3.4 years for those diagnosed in their 90s. Ganguli et al. (2010, Arch Neurol) and subsequent meta-analyses corroborate these broad ranges, with individual studies varying by population, care setting, and diagnostic era.
This calculator applies age-band medians and a small sex adjustment (women survive on average roughly 0.5 year longer than men in most studies, attributed to greater baseline brain reserve and earlier diagnosis). The result is a statistical population estimate — not a forecast for any individual.
Significant factors not captured here include: dementia severity at the time of diagnosis (earlier-stage diagnoses naturally show longer survival from time of diagnosis), comorbid conditions (cardiovascular disease, diabetes), care quality, physical fitness, and genetic risk factors such as APOE ε4. Diagnosis dates have also become earlier over time as awareness has grown, inflating apparent survival in recent cohorts (lead-time bias).
Frequently asked questions
Published studies report a median survival of roughly 3–10 years, heavily depending on age at diagnosis. People diagnosed in their 60s often live 8–12 years or more; those diagnosed after 80 typically have a median survival of 3–5 years. These are population averages — some individuals live much longer or shorter.
Age at diagnosis is the strongest predictor. Other important factors include disease stage at diagnosis (early-stage has longer survival), comorbid conditions, presence of the APOE ε4 allele, general health, and access to high-quality care and support.
Studies consistently show women survive slightly longer than men after an Alzheimer's diagnosis (roughly 0.5–1 year in most cohorts). Proposed reasons include earlier diagnosis in women (because women's verbal memory may be better preserved early), greater social support networks, and survival bias (women already outlive men on average).
TG we-Calculate Editorial Team. (2026). Alzheimer's Life Expectancy Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/alzheimers-life-expectancy-calculator
TG we-Calculate Editorial Team. "Alzheimer's Life Expectancy Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/alzheimers-life-expectancy-calculator.
TG we-Calculate Editorial Team, "Alzheimer's Life Expectancy Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/alzheimers-life-expectancy-calculator
@misc{wecalculate_alzheimers_life_expectancy_calculator, title = {Alzheimer's Life Expectancy Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/alzheimers-life-expectancy-calculator}}, year = {2026}, note = {TG we-Calculate} }
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