The phrase "middle-aged man" typically refers to someone between the ages of 40 and 60. However, there are several synonyms that can be used to describe this demographic group. Some of the commonly used synonyms include "midlife man," "mid-aged man," "middle-years man" and "midway man." These synonyms can help to add some variety to written or spoken English, and may be particularly useful for those who wish to avoid being repetitive in their language usage. Ultimately, which synonym is chosen will depend on the context in which it is being used and the writer or speaker's personal preference.