A key part of wording a 60th birthday invitation is being positive and upbeat, saying something to the effect of "turning 60 isn't that bad, and we are glad," according to Dgreetings.com. Another supportive saying would be something like "sixty and still going strong!" It is important to acknowledge a person's age in a fun and humorous way.
According to Cards Shoppe, the wording of an invitation can also be serious, simple or witty. Allow that person's character to shine through the words. Reference something that comes along with being 60, such as retirement or Medicare, but word it in a way that is playful. Cards Shoppe has cute forms of phrasing, such as "Prepare for Medicare." It is important to be creative, use rhymes when necessary and keep it short.
SpecimenTemplates.org provides helpful tips, such as deciding whether to use formal or informal wording based on how well the guest is known. The wording should also include obvious information, such as the reason for the party and the time and date of the event. Special instructions should also be given, such as bringing gifts or dressing in a certain way. If the invite is time sensitive, a deadline should be included.