Old chaps is a colloquial term that refers to a group of elderly men. There are several synonyms for old chaps that can be used interchangeably such as old geezers, senior citizens, pensioners, elders, and senior folks. These synonyms may vary depending on the context in which they are used. For instance, pensioners and senior citizens are terms used to refer to older people who are retired, while old geezers and elders suggest a higher level of old age where experience and wisdom come into play. All of these synonyms are acceptable alternatives to the term old chaps, and can be used depending on the writer's or speaker's preference, tone, and audience.