Washington University School of Medicine in St. Louis found in a PET scan study of 205 individuals aged 20 to 82 that 1) the women had brains that were an average 3.8 years younger than their actual age and 2) the men had brains that were an average 2.4 years older than actual age. Researcher Dr. Manu Goyal said that younger brains may account for the lower prevalence of cognitive decline in women, but more studies are needed. Washington University School of Medicine study
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