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»