In the original books, Alice is 7 in the first book and 7 1/2 in the sequel. She first enters Wonderland on her 7th birthday. Through the Looking Glass and what Alice Found There takes place exactly...
In the original Disney Cartoon 1953) it is not said how old she is, but in the Tim Burton movie (2010) she starts off at 6 years old then we jump to her when she is 19 borderline 20 :D
'Alice' is not the main character in the book Go Ask Alice. Alice was just a girl that was briefly mentioned in one paragraph in the book. The main character of the story was never released. It was a...