What to Write on a Retirement Cake?
You most likely want to put something that will be tasteful and encouraging to the person retiring. However, putting something funny might also be fun. Click here: http://www.housingforseniors.com/Questions/What-is-a-good-saying-to-write-on-a-retirement-cake--1375.html
There are plenty of good messages that you can write on a retirement cake. You can write "Congratulation for a job well done" or "You ended a contract to start a lifetime."