Sahih al-Bukhari, 5134; Book 67, Hadith 70: “The Prophet [ﷺ] married Aisha when she was six years old and he consummated his marriage when she was nine years old.”
Talmud Sanhedrin 54b in response: “Hold my beer.”
I don't get the comment. I just spent some time looking through the web page --
Source: https://www.sefaria.org/Sanhedrin.55a.6?lang=bi
--- and did not come across what perhaps you may have intended. The references to age nine seem to be about differing reasoning, but all acts with those under nine are prohibited, as with homosexual acts and more for those above that stated age. Or do you read it differently?