I know a 60 year old woman who is still paying off student loans from her son's education at TU (Univ.of Tulsa). He offered to pay it off but she insists she promised him that and is going to "do it." She will be almost 70 when it is paid off. He was successful. He is licensed in 42 states, has a national reputation, and a highly regarded engineer. He has been out of school 12 years. So it might be considered "worth it." What if they had taken something like business? And found no job outside running a Dollar General? Would that have been a good "investment"?