You are not bound to ask only 15 questions. Remember, each question that you ask your partner can potentially generate a half dozen additional questions.
When it's all said and done, your autobiographies will only be as interesting - only be as deep, as the multi-layered, personal, probing questions that you ask your partner.
Here are several autobiographical excerpts. Read several of the excerpts, then, post your thoughts about the opening paragraphs. Explain how the author captured (or didn't capture) your attention right away with the first couple sentences of the opening paragraph. Exlplain how you might consider opening your autobiography.