A long time later.During Princess Twilight Sparkle`s long life,as a great mentor and also a kind senior,she has trained countless students and brought the trues of friendship to many creatures.As a princess and an Alicorn,she could have lived forever, but she chose to be an old pony——same as her dear friends.
Because of her trustworthy students,she pass on the duties of the princess to them,and retired as a professor of friendship school.Times later,the young creatures only think she is a normal old lady,but can`t imagine she used to be a famous princess in the past.

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Well,honest….I still can`t accept that end of G4.I think Twilight values ​​her friends more than her status as a princess,and it is too sad to see she is always young but other mane 5 getting older.Although I can`t change Hasbro`s idea,but I want her has a normal life in my AU.The princess' burden is too heavy for her.

They will live happily together and then grow old together.They are,and will always friends.