Further, in a recent meta‐analysis of three population‐based cohorts of cognitively normal subjects aged 60–75 years (total N = 11,771), the risk of dementia in APOE ε4/ε4 homozygotes (N = 134) to age 70–75 years was 11.2% (Qian et al., 2017). Here, APOE is linked to dementia.