The phrase “retired or no longer exists” implies that something or someone has ceased to be active or has vanished. A synonym for this could be “withdrawn or vanished”. “Withdrawn” suggests that something has been removed or pulled back from its previous state or activity. For example, “The old product line was withdrawn as it was no longer profitable.” “Vanished” emphasizes that something has disappeared completely. For instance, “The once-thriving species has now vanished from the ecosystem.”
Another synonym is “discontinued or extinct”. “Discontinued” is often used for products or services that are no longer being produced or offered. For example, “The company discontinued that model due to low demand.” “Extinct” is used in a more biological context to mean a species that no longer exists. For instance, “The dinosaurs are extinct.”
“ceased to be or gone” is also a good synonym. It simply states that something has stopped existing or is no longer present. For example, “The old tradition has ceased to be and is now only a memory.” “Gone” implies that something has left or disappeared. For example, “The opportunity is gone and will not come again.”
All of these synonyms for “retired or no longer exists” help to describe the state of something that is no longer active or present in different contexts.