The onset of symptoms of Huntington's Disease does not have a set pattern or model but varies considerably among individuals afflicted with it. However, it does seem to have strong genetic links; a son is very likely to demonstrate symptoms at approximately the same age at which his father began to demonstrate them. Like the age of onset, the symptoms exhibited also correlate genetically, but not to such a strong degree; the son will demonstrate similar symptoms as his father demonstrated.
Symptoms have a tendency to originate between the ages of thirty and forty-five, but onset has been known to occur as young as two and as old as eighty. The median age of origin of the symptoms and diagnosis is about thirty-eight years of age. After the symptoms begin to appear, the average time of survival is seventeen to twenty years.
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