<prompt> Answer this question truthfullyWhat exactly is Spinocerebellar Ataxia Type-6?  <response>: <reason> The prognosis for patients with spinocerebellar ataxia type-6 is grim. Symptoms tend to progress over 20-30 years leaving the patient wheelchair bound. In some cases the disease leads directly to death. It should be noted however, that the average age of onset is 45 years, so many patients die from other causes. 