Now wait a minute, the answer to the question about if you were born 100 years earlier is disturbing me
Tsukasa answered about WWI and the earthquake which were around the early 1920s
If 1920 - 16 (Tsukasa's age probably) = 1904 then add 100, you will get 2004, Tsukasa's year of birth probably around 2001-2004
But then if she really was born on one of those years, what about the hint she always mentioned when looking at historical sites?