The present study investigated the relationship between KIBRA alleles (T carriers vs. CC homozygotes), cognitive performance, and brain volumes in three groups of cognitively healthy adults—middle aged (ages 52–64, n = 38), young old (ages 65–72, n = 45), and older old (ages 73–92, n = 62)—who were carefully matched on potentially confounding variables including apolipoprotein ε4 status and hypertension. The gene discussed is WWC1; the disease is hypertensive disorder.