“Huntington Disease (HD) typically begins between the ages of 30-45, though onset may occur as early as the age of two or as late as the 70s.  HD affects males and females equally and affects all ethnic and racial groups.  Symptoms of HD can differ from person to person, even for members of the same family.  Early symptoms may include depression, mood swings, forgetfulness, clumsiness, involuntary twitching, and lack of coordination.  HD usually progresses over a 10-25 year period. Death follows from complications such as choking or infection.  Affected individuals require assistance for daily care such as bathing and dressing.  Each child of a person with HD has a 50% chance of inheriting the HD-causing gene mutation.  More than 250,000 Americans have HD or are “at-risk” of inheriting the disease from an affected parent.  A blood test can accurately determine whether an adult carries the HD-causing gene.”

Hennepin Healthcare (https://www.hennepinhealthcare.org/specialty/neurology/huntingtons-disease-clinic/hd-facts/)