Dementia Risk Persists Past 90 With Stark Disparities — SkimNews
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- The LifeAfter90 study followed 800+ Kaiser Permanente members with a median age of 92 since 2018, evaluating them every six months — the first dementia-after-90 study conducted in a highly diverse cohort.
- Women over 90 faced roughly twice the dementia risk of men, with Black participants carrying a 75% higher risk than Asian participants and Hispanic participants also showing significantly higher incidence rates.
- APOE2 carriers had a 60% lower dementia risk even beyond age 90, while APOE4 roughly doubled risk among Black participants and elevated risk specifically among men.
- Some participants carrying APOE4 or diagnosed with hypertension and high cholesterol in their 60s and 70s remained cognitively healthy into their 90s — a puzzle researchers say could reveal biological or environmental protective mechanisms.
- Senior author Rachel Whitmer of UC Davis Health warned clinicians cannot assume high-risk patients are 'in the clear' simply because they reach 90 without dementia, urging continued risk reduction for everyone.
- With roughly 230 million people projected to be 90 or older worldwide by 2100, understanding dementia risk in extreme old age is an increasingly urgent public health question.
Why it matters: Clinicians caring for the over-90 population — projected to reach 230 million globally by 2100 — now have data showing dementia risk isn't uniform after 90: women face roughly double the risk of men, and Black participants 75% higher than Asian participants. Whitmer's warning reframes geriatric care: hitting 90 without symptoms doesn't eliminate risk.
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