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At what age does polycythemia occur?

While polycythemia can occur at any stage of life, the median age for diagnosis of the most common type, polycythemia vera (PV), is around 60 years old. The specific age of onset for polycythemia depends heavily on whether the condition is primary (acquired or congenital) or secondary, as well as the underlying cause. This makes understanding the different types crucial to answering the question: At what age does polycythemia occur?.