Who gets PSP?
Approximately 20,000 Americans�or one in every 100,000 people over the age of 60have PSP, making it much less common than Parkinson's disease, which affects more than 500,000 Americans. Affected individuals are usually middle-aged or elderly, and men are affected more often than women. PSP is often difficult to diagnose because its symptoms can be very much like those of other, more common movement disorders, and because some of the most characteristic symptoms may develop late or not at all.
