Hi thanks for contacting HCM... Noted he has diagnosed with acute hepatitis .... So some lifestyle measures has to be taken.. If not then complication can occur sometime fulminent liver failure can occur.... Take low fat diet... Strickly avoidence of alcohol... Green leafy veg more... Fried food and non veg taken very much less.... Rest is done. One tsp licorice with honey useful... Fruits , green leafy veg , apple juice , papaiya , avocados good for liver. Early in morning take carrot juice.... If cause for acute hepatitis unknown with full history and investigation then biopsy might needed. So rather then thinking about his life expectancy consult gastroenterologist for examination... Take care. Dr..Parth