Bruce,
Are you making a living at this? If so then you likely need to find a way to keep those pesky (and penurious) seniors from stealing your work. On the other hand if shooting senior citizens (photographically, at least initially
) is a hobby/past time then think of it as free advertising. Sure they can keep ripping off copies to send to the grand kids but 1) you've likely made their day and 2) you never know when one of these chintzy old fogies may ask you to shoot the grand kids, or the entire family. Or I could be completely wrong.