Barrett Is 86 Years Old and Has No Signs of a Neurocognitive

Barrett is 86 years old and has no signs of a neurocognitive disorder. Is this common for this age group?

A) Yes, only a small percentage of adults older than age 85 have a neurocognitive disorder.
B) It could go either way. About half of adults older than age 85 have a neurocognitive disorder, meaning the other half do not.
C) It depends on Barrett's race/ethnicity. About two-thirds of non-Hispanic white adults older than age 85 have a neurocognitive disorder, but only about one-fourth of African Americans do.
D) No. The vast majority of adults older than age 85 have a neurocognitive disorder.