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In page Dementia:

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A helpful finding was that although the incidence of Alzheimer's disease increased with age (from 5–10% of 75-year-olds to as many as 40–50% of 90-year-olds), no threshold was found by which age all persons developed it. This is shown by documented supercentenarians (people living to 110 or more) who experienced no substantial cognitive impairment. Some evidence suggests that dementia is most likely to develop between ages 80 and 84 and individuals who pass that point without being affected have a lower chance of developing it.[citation needed] Women account for a larger percentage of dementia cases than men.[9] This can be attributed in part to their longer overall lifespan and greater odds of attaining an age where the condition is likely to occur.[10]