Old moons can refer to a variety of synonyms that describe something old or no longer relevant. Some of these synonyms include antiquated, outdated, archaic, obsolete, ancient, and passe. The term old moons can also connote a sense of nostalgia, reminiscing about the past and the passing of time. Other synonyms for old moons are remnants, relics, vestiges, and remnants, implying an object that has outlived its usefulness. Whatever the context may be, using synonyms for old moons can add depth and variety to any piece of writing, helping the reader to fully grasp the idea of something old and past its prime.