Some degree of decline in cognitive abilities is generally expected with aging; ovarious terms to describe this phenomenon include benign senescence forgetfulness, age-associated memory impairment (AAMI), and age-associated cognitive decline. These are generally considered non-pathological and only minimally impairing.
Mild Cognitive impairment
MCI is a term used to describe transitional stages between normal aging and early dementia; it is considered to be a pathological condition, as it is associated with increased risks for dementia and impairment in functioning.
R. C. PETERSEN Mild cognitive impairment as a diagnostic entity. Journal of Internal Medicine 2004; 256: 183–194