The dystopian science fiction film In Time (2011) offers a fascinating and morbid premise.  In the future, we are told, time is the ultimate commodity.  Everyone is genetically engineered so that the aging process stops at the twenty-fifth year; after this, each person has only one more year of life.  A numeric counter is visible on the forearm to show exactly how many years, months, weeks, days, hours, minutes, and seconds each person has remaining on his balance of life.