Use the correct form of tener:
Tú __________ 15 años.

When entering your answers for fill in the blank and essay questions, please be sure to use accent marks and/or correct punctuation to avoid your answer being marked incorrect.

You may copy and paste the accented character or punctuation mark from this list if needed:
á é í ó ú ñ Á É Í Ó Ú ¿ ¡