Aisha was 17-19 when she married the Prophet sallahu alayhi wasalam. It's common misinformation to believe she was 6 years old.
Sahih al Bukhari says she was 6 when married, 9 at the consummation. Mohammed was a pedophile
It's likely a typo in Bukhari. Here is a litany of other Sahih ahadith that say otherwise (some also in Bukhari):
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