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Mortality and Disease Prevalence among the Oldest Old.

Despite mortality improvements, mortality rates among the oldest old (ie, ages 90+) are still extremely high - high enough to invalidate commonly used rules of thumb that apply at younger ages. Due to the "bathtub" relationship between incidence, recovery, death, and prevalence, the prevalence of such chronic conditions may actually drop at the oldest ages, even without medical improvements in prevention or treatment.