What is j'ai onze ans ans et mon anniversaire mean in french?

The phrase "j'ai onze ans et mon anniversaire" in French translates to "I am eleven years old and my birthday" in English. However, it is incomplete; it seems to be missing the rest of the sentence that would specify when or how the birthday is celebrated. Typically, one might say "J'ai onze ans et mon anniversaire est en [mois]" to complete the thought.