One,only has to look at the married life of Prophet and his wife Ayesha to realize how soulful and how compassionate they were towards each other.Ayesha never married any one after his death when she was just 20 at the prime of her youth
Now do 9 age women of yerster generations looked and behaved like the school kids of today?certainly not. If you look back in history,You will not be surprised to learn before few centuries ago that a girl of 9 years had a stamina,physical attributes and mental maturity of a teen age Woman.You can verify this just by asking at what age your grand mother got married , it certainly wont be more than 13 Even If the previous generation of women got into marriage as early as 13, you will now not be surprised 1400 years ago a 9 yrs old who attained puberty is not a Kid any more but a Woman.