How bad is stage 4 liver cirrhosis and what is the life expectancy?

Stage 4=cirrhosis: The prognosis of cirrhosis is highly variable since it is influenced by a number of factors, including etiology, severity, presence of complications, and comorbid diseases. Scoring systems are available to give you an idea of life expectancy but are far from exact. You should discuss this with your doctor.

Need more info : Stage IV is cirrhosis by definition. Prognosis is base on symptoms / episodes of dexompensation as well as meld score which uses blood results to predict 3month mortality.