The study population includes individuals affected by Alzheimer's Disease, mild cognitive impairment, other dementias, cognitively healthy individuals without memory problems, or their family members.~Ascertainment is across both males and females, and all race and ethnic groups.
The aim of this study is to identify genetic factors that contribute to risk and progression of early-onset dementia (loss of memory function before the age of 70 years) across all ethnic groups, including Alzheimer's Disease, mild cognitive impairment and other dementias.