How long can someone in their early 40s with early chronic lymphocytic leukemia live?

It depends : This often is a disease that has a very long survival. There are ways to predict survival such as extent of disease and markers on the cells, such as zap-70. I would review these with your doctor to get the details for your case.

See below...: Cll is usually not an aggressive form of leukemia and has a relatively good prognosis overall. Survival depends on stage and some other factors but for a mid-age patient with no additional risk factors survival is usually very long (decades).