Allah's Apostle ﷺ married me when I was six years old, and I was admitted to his house when I was nine years old. (Using translation from Muslim 1422b)
تَزَوَّجَنِي رَسُولُ اللهِ ﷺ وَأَنَا بِنْتُ سِتِّ سِنِينَ وَبَنَى بِي وَأَنَا بِنْتُ تِسْعِ سِنِينَ وَبَنَى عَلَيَّ فِي شَوَّالٍ فَأَيُّ نِسَائِكُمْ كَانَ أَحْظَى مِنِّي؟ وَكَانَتْ تَسْتَحِبُّ أَنْ تَدْخُلَ نِسَاؤُهَا فِي شَوَّالٍ