<prompt> Answer this question truthfullyWhat are the epidemiological and demographic characteristics of prolymphocytic leukemia in B-cells?  <response>: <reason> The median age for the development of B-cell prolymphocytic leukemia is around 65-69 years of age. The incidence of B-cell prolymphocytic leukemia is 1 of lymphocytic leukemias. There is no gender predilection. The duration of median survival for this disease is 30-50 months. 