https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1474018/figure/F3/ Seattle longitudinal study. Aside from perceptual speed and numeric ability most cognitive ability declines starting at age 60 IN SEATTLE! | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1474018/figure/F3/ Seattle longitudinal study. Aside from perceptual speed and numeric ability most cognitive ability declines starting at age 60 IN SEATTLE! |