In Pennsylvania a citizen must be 18 years of age or older in order to draft an Advance Health Care Directive. Exceptions apply if the citizen is a high school graduate, married, or legally emancipated. But is that the most appropriate cutoff age for legal authority? Would it make you queasy to grant that power to someone twelve years of age? Well that’s exactly what some countries have done. In Australia, for example, anyone twelve years of age or older can draft an advance health care directive. See more here: