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How sharp you are at age 65 may be tied to something totally out of your control: your blood type. And people with Type AB blood — the least common type — may face a particularly high risk of memory loss later in life, according to a study published Wednesday in the journal Neurology.
The researchers asked more than 1,000 people age 45 and older to perform cognitive and memory tests — learning and then recalling a list of 10 words, for example — and then took a blood sample from each study ...