Can you drink considerable hard liquor for 50 years and not have liver injury?

Very unlikely. Generally, for men more than three drinks ( in gram more than 30 gm) and female more than two drink ( in gram more than 20 gram) can result in cirrhosis in the long term. However, genetic structure and immune status of a person can also play a role. Some may develop early, in some other people it may take longer time.