As a follow-up to What information is given about the age and history of Mori Summer in the Chuunibyo anime?, I'm curious- what information is given about the age and history of Mori Summer in the Chuunibo light novels? And what are the qualities of the sources of that information (first-hand / second-hand / possibly faulty memory / citable from writings)?
Note that I'm purposely asking these as two separate question posts because of How much does the Chuunibyou anime differ from the light novels?.
