If I may respond to your Q to X-Ray,
Yes Prophet Muhammad (p&buh) was married (contract) to Aisha (r.a) mother of the believers when she was 9 or 11 but the marriage did not consummate till she reached the puberty age.
Further more if i may say (on your prophet), the prophet Muhammad (p&buh) is the messenger of Allah for all of us regardless of our faith and beliefs. As Allah says in his words (the Noble Quran)
[Best English interpretation of the meanings]
106 Verily, in this (the Quran) there is a plain Message for people who worship Allah [i.e, the true, real believers of Islamic Monotheism who act practically on the Quran and Sunnah-the legal ways of the Prophet (p&bu)]
107 And We have sent you (O Muhammad, p&buh) not but as a mercy for the Alamin* (mankind, jinn and all that exists)
From the Noble Quran Chapter No 21 Surat Al Anbiya (the prophets) verse/ayat no. 106 & 107
Of course it is the free will of all of us to follow the book, the teachings of the prophet (p&buh) fully or partly or not at all]

Allah knows the Best.