The phrase "mid-sixties" typically refers to a person's age range, specifically those who are in their mid-60s. However, there are other terms that can be used to refer to this same age group. For example, one might use the phrase "late mid-life" or "late 60s". Other synonyms for "mid-sixties" include "senior citizen", "golden ager", "elderly", "geriatric", or simply "older adult". Although the use of these alternative phrases can depend on context and tone, they all generally refer to people who have reached a certain age and have experienced life in a variety of ways.