The phrase "back forties" is often used to reference a period of time in the past. However, there are various synonyms that can be used to convey the same meaning. "Yesteryear," "bygone days," "olden times," "days of old," "days gone by" and "the past" are all examples of words or phrases that can be used instead of "back forties." These synonyms can help to convey a sense of nostalgia or a longing for a simpler time. They are also useful for adding depth and richness to language, allowing writers to convey meaning in a more nuanced way.