Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Thrombocythemia and Thrombocytosis? ?
    ### Response:
    Primary Thrombocythemia
                
Thrombocythemia isn't common. The exact number of people who have the condition isn't known. Some estimates suggest that 24 out of every 100,000 people have primary thrombocythemia.
                
Primary thrombocythemia is more common in people aged 50 to 70, but it can occur at any age.
    