Alzheimer's Life Expectancy Calculator
The Alzheimer's Life Expectancy Calculator gives a rough estimate of average survival after an Alzheimer's diagnosis, based on age at diagnosis and sex. Survival tends to be longer for those diagnosed younger and slightly longer for women.
Rates and fees change frequently. Always confirm the current figures
with the official authority before relying on this result.
Formula
Estimated survival ≈ 8.5 − (age at diagnosis − 65) × 0.27, with a small adjustment for sex
- Studies show average survival after an Alzheimer's diagnosis is roughly 4–8 years, though some people live much longer.
- Survival is generally longer when the diagnosis is made at a younger age and is on average slightly longer for women.
- This calculator uses a simplified linear model and should be read as a population average, not an individual prediction.
- Actual prognosis depends on overall health, disease stage at diagnosis, other conditions and quality of care.
Example Calculation
Inputs
- Age at Diagnosis (years): 75
- Sex: female
For a woman diagnosed at 75: 8.5 − (75 − 65) × 0.27 + 0.7 ≈ 6.5 years of average survival, reaching roughly age 81 — an average, with wide individual variation.
Frequently asked questions
How long do people live with Alzheimer's?
On average about 4–8 years after diagnosis, though survival ranges widely and some people live 15 or more years.
Why does age at diagnosis matter?
People diagnosed at a younger age tend to survive longer in absolute years than those diagnosed at an older age.
Does sex affect survival?
On average women tend to live slightly longer after diagnosis than men, which this estimate reflects with a small adjustment.
Is this an accurate prediction for me?
No. It is a population-average estimate. Individual outcomes depend on health, disease stage, comorbidities and care.
What else influences prognosis?
Overall physical health, how advanced the disease is at diagnosis, other illnesses, and access to good care all play a major role.