According to the FBI, senior citizens fall prey to scams and con artists at alarming rates each year. Part of the reason is because they are presumed to fall into categories attractive to con artists.
Medical Alert Scams
There are many phone scams including the "grandparent scam" in which someone calls to tell them their grandchild is in trouble and needs money for bail or medical treatment. They're told to send money via Western Union or other methods.