CLL/SLL is both a leukemia and lymphoma. It is a leukemia because it is found in the blood and a lymphoma because it originates the lymphoid cells.
While the average age of diagnosis of CLL is 71 or 72, some patients are diagnosed in their 20s and some in their 90s.
For unknown reasons, CLL is slightly more common in men than women.
Originally published in The CLL Tribune Q1 2018.