The early stages of Alzheimer's disease are difficult to diagnose. A definitive diagnosis is usually made once cognitive impairment compromises daily living activities, although the person may still be living independently. The symptoms will progress from mild cognitive problems, such as memory loss through increasing stages of cognitive and non-cognitive disturbances, eliminating any possibility of independent living, especially in the late stages of the disease. Life expectancy of people with Alzheimer's disease is reduced. The normal life expectancy for 60 to 70 years old is 23 to 15 years; for 90 years old it is 4.5 years. Following Alzheimer's disease diagnosis it ranges from 7 to 10 years for those in their 60s and early 70s (a loss of 13 to 8 years), to only about 3 years or less (a loss of 1.5 years) for those in their 90s. It is about 50% life expectancy with Alzheimer's disease. Fewer than 3% of people live more than fourteen years. Disease features significantly associated with reduced survival are an increased severity of cognitive impairment, decreased functional level, history of falls, and disturbances in the neurological examination. Other coincident diseases such as heart problems, diabetes, or history of alcohol abuse are also related with shortened survival. While the earlier the age at onset the higher the total survival years, life expectancy is particularly reduced when compared to the healthy population among those who are younger. Men have a less favourable survival prognosis than women. Pneumonia and dehydration are the most frequent immediate<unk> s of death brought by Alzheimer's disease, while cancer is a less frequent<unk>  of death than in the general population.
medical cause of Dementia
medical cause of Frontotemporal dementia
symptom of Alzheimer's disease
medical cause of Parkinsonism
complications of Frontotemporal lobar degeneration
symptom of Amyotrophic lateral sclerosis
symptom of Lesch–Nyhan syndrome
medical cause of Dystonia