Sexagenary is a term that refers to something or someone that is 60 years old. However, there are several other ways to express this concept using synonyms. For instance, one might utilize the term "sexagesimal" as it is employed to describe a system of counting based on sixties, as in those utilized by the Babylonians and ancient Sumerians. Another option could be the phrase "sexennial," which means something that occurs every six years, such as an anniversary or a celebration. Additionally, one might use the expression "Diamond Jubilee" to refer to a 60th celebration or mark of achievement. There are several ways to express the concept of 60th anniversaries, achievements, and markers using synonyms to "sexagenary".