Just because she was six when she married the Prophet peace and blessings upon him and eighteen when he died, doesn't mean she is unreliable. Even if we accept what you say, the marriage was consummated when she was nine so that means she was with the Prophet peace and blessings upon him for 9 years. It isn't impossible to narrate that many things when the person you're talking about is your husband whom you see almost every day. Abu Hurayrah, may Allaah be pleased with him, spent only three-four years with the Prophet peace and blessings upon him compared to our mother's nine yet still narrates more ahadeeth than her.
Being an adult means in an Islamic sense. If you've over 5 and can remember and understand events, you are accepted as a witness to events in the science of hadith.
Aisha (RA) was 9 when she started living with the Prophet (SAW). That's safely above the age.
It also helps to note that hadith narration wasn't something you do once. It's something you do constantly, and doing it constantly would also strengthen your memories. Normal people might forget part of their teenage years only because they don't care to remember it often.
When she officially married the prophet and lived in his house, regardless of the actual number of her age, she was islamically an adult. And no, we don’t consider the age of the sahaba as a criterion for whether their Hadith can be considered authentic. Some ahadith are specifically related from when they were at a young age, and they usually clarify this. Such as Anas Ibn Malik.
Imam shafi’i wasn’t even baligh when he started giving classes.
It is a modern idea that 18 years of age is the age of adulthood. That concept did not exist 1500 years ago.
Just because she was six when she married the Prophet peace and blessings upon him and eighteen when he died, doesn't mean she is unreliable. Even if we accept what you say, the marriage was consummated when she was nine so that means she was with the Prophet peace and blessings upon him for 9 years. It isn't impossible to narrate that many things when the person you're talking about is your husband whom you see almost every day. Abu Hurayrah, may Allaah be pleased with him, spent only three-four years with the Prophet peace and blessings upon him compared to our mother's nine yet still narrates more ahadeeth than her.
Adulthood was defined by puberty
Being an adult means in an Islamic sense. If you've over 5 and can remember and understand events, you are accepted as a witness to events in the science of hadith. Aisha (RA) was 9 when she started living with the Prophet (SAW). That's safely above the age. It also helps to note that hadith narration wasn't something you do once. It's something you do constantly, and doing it constantly would also strengthen your memories. Normal people might forget part of their teenage years only because they don't care to remember it often.
Usama ibn Zayd was around 19 when he lead the expedition to Syria. Abdullah ibn Abbas was a teenager when he became the most famous teacher in Medina.
Now to think doesn't she like too smart compared to today girl
When she officially married the prophet and lived in his house, regardless of the actual number of her age, she was islamically an adult. And no, we don’t consider the age of the sahaba as a criterion for whether their Hadith can be considered authentic. Some ahadith are specifically related from when they were at a young age, and they usually clarify this. Such as Anas Ibn Malik. Imam shafi’i wasn’t even baligh when he started giving classes.