Final answer:
The French phrase "J'ai onze ans" translates to "I am eleven years old" in English, indicating the speaker's age.
Step-by-step explanation:
The phrase "J'ai onze ans" literally means "I am eleven years old" in English. In this sentence, 'J'ai' translates to 'I have', and 'onze ans' translates to 'eleven years'. In French, instead of saying 'I am (age) years old' as in English, the construction is 'I have (age) years'. It is how age is expressed in French.