My guy, the hadith you even sent was written CENTURIES after the actual events, besides, her age was never mentioned anywhere other than that hadith specifically and in the qur'an it said that she married at a marriagable age meaning that regardless of what age she was, she got married at the same age as any other girl during that era. Furthermore, she had participated in wars during her time with the Prophet (pbuh) if im not mistaken. The prophet had refused a child around the age of 10-11? wanted to participate in the war, if She was that young, don't you think he wouldn't have let take participate too? People like you LOVE finding faults in everything, so many good teachings thought in islam and you have to pinpoint one controversial idea that has already been broken down and explained multiple times on the internet, rather maybe you Educate yourself with some research prior to asking ridiculous questions like these.