Different studies have stated that Alzheimer’s disease progresses over two to 25 years with most patients in the eight to 15 year range. Nonetheless, defining when Alzheimer’s disease starts, particularly in retrospect, can be very difficult.
Erinevad uuringud on kinnitanud, et Alzheimeri tõbi progresseerub üle kahe kuni 25 aastaks kõige patsiendil kaheksast kuni 15 aastal vahemikus.