Retainers are used by all ages these days and they are not just made of metal anymore. Those old metal braces have given way to clear plastic retainers. Many older adults will have problems with crowding and bunching of their teeth as they age and could use retainers. It's just the opposite of younsters wearing braces trying to straighten their teeth by moving them, the old folks are trying to keep their teeth in place and not have them move and crowd and bunch up. And photos show the entire process that happens at the dentist office to make the retainers happen. So, retainers are not just for kids!.