On the eve of my thirty-fifth birthday I wrote: Mar.
March, the twenty-ninth, was my sixty-fifth birthday.
His seventy-fifth birthday, February 27, was passed very quietly at home, in spite of the many celebrations held elsewhere.
Again, upon his seventy-fifth birthday, there were great rejoicings in the Cambridge schools, as indeed in those of many other cities far and wide.
Patey and I were speaking and writing some time ago about the seventy-fifth birthday.
And so the time went by till at last he reached his twenty-fifth birthday, at which date this strange and, in some ways, awful history really begins.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "fifth birthday" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.