Age distinguished most Alzheimer’s stages in Down syndrome
Age scored above 0.85 for distinguishing protein buildup or mild cognitive impairment, but 0.588 for mild impairment versus dementia, where one means perfect separation.
Our read
Biomarkers- Studied:
- Cohort study of 471 people with Down syndrome
- What changed:
- Age differentiated most Alzheimer's disease stages with AUCs > 0.85, but discriminated mild cognitive impairment from dementia at 0.588
- The catch:
- The baseline-only analysis compared existing stages; future progression was not measured
- In the record:
- One of 15 papers on age on record: 6 with results in people.
- Why it’s aging research:
- It bears on staying healthy in midlife and later life.
Editor of record: Boris Djordjevic · AgingResearch.News
In a retrospective cohort study of 471 people with Down syndrome aged 25 to 70, researchers compared age with measures of Alzheimer’s disease stage. They analyzed each person’s first study visit, testing up to 148 measures in groups of up to 461 participants. Measures included brain scans, blood and spinal fluid tests, and cognitive assessments.
Age matched or outperformed every measure tested except when distinguishing mild cognitive impairment from dementia. It separated people with and without buildup of amyloid or tau, two proteins associated with Alzheimer’s. It also distinguished stable cognition from mild cognitive impairment. These classification scores exceeded 0.85 on a scale where 0.5 means chance and one means perfect separation. For mild impairment versus dementia, age scored 0.588, and memory measures performed better. The authors suggested age could help screen people for future clinical trials.
Why it matters
Alzheimer’s dementia occurs at predictable ages in Down syndrome. The authors suggested that this pattern offers an opportunity for very early intervention.
Caveats
This baseline-only analysis compared existing stages, not future progression, and cognitive tests also helped define clinical stages. Participants had IQ scores of at least 30; conditions that interfered with cognitive assessment were excluded.
The paper
Age predicts Alzheimer's in Down syndrome better than MRI, plasma, or cognition
Washington University in St. Louis
Alzheimer's & Dementia, Jul 2026, Open access
Presented at AAIC 2025 as an abstract
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