There is no guarantee that your father will become addicted to his pain medication. If the medication is used as prescribed, it is less likely that your father, or any other senior, will become addicted. That being said, prescription drug abuse in seniors can go unnoticed. Seniors are at a higher risk to develop an addiction to painkillers, and this can happen at lower doses. If your father has a history of addiction, you should voice your concerns to your doctor.