About 70 percent of individuals with Down syndrome who live past age 40 show symptoms of __________ disease.

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Individuals with Down syndrome have an increased risk of developing Alzheimer's disease as they age. This is thought to be due to the extra copy of chromosome 21 which contains the gene that produces beta-amyloid, a protein that accumulates in the brains of Alzheimer's patients. Studies have shown that by age 40, approximately 70 percent of individuals with Down syndrome have symptoms of Alzheimer's disease.

About 70 Percent of Individuals with Down Syndrome Who Live