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Alzheimer's disease (AD) is a neurodegenerative disease and the most common cause of dementia; it usually occurs in old age. Familial Alzheimer's disease (FAD or EOFAD for early onset) is an inherited and uncommon form of AD. Familial AD usually strikes earlier in life, defined as before the age of 65.
When the disease is caused by autosomal dominant variants, it is known as early onset familial Alzheimer's disease, which is rarer and has a faster rate of progression. [17] Less than 5% of sporadic Alzheimer's disease have an earlier onset, [17] and early-onset Alzheimer's is about 90% heritable.
The impact on life expectancy depends on the individual condition, [9] but is usually severe without treatment. [1] [3] It's estimated only 25–29% of people affected survive to adulthood, and only 10% to the age of 50. [1] The median life expectancy is around 9 years, and the average life expectancy is 16.3 years. [1]
“Alzheimer’s disease has a long pre-symptomatic period; Alzheimer’s-related changes take place in the brain 10, 15, even 20 years before the onset of memory and thinking symptoms.
One genetic variant associated with Alzheimer’s disease progression is presenilin 2 (PSEN2), which is correlated to an increased risk for early-onset familial Alzheimer’s disease (EOFAD ...
Early onset dementia is less common than late onset dementia, the former accounting for approximately 10% of dementias globally. [3] Recent studies estimate the prevalence of early onset dementia to be approximately 3.55 million people aged 30–64 worldwide, and will triple by 2050. [7] with an incidence of 119 per 100,000 individuals. [1]
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