so Jemz helped me work it out:
ETA: Shoon's birthday fixed. Jemz has earned a FAILBETA.
THE OFFICIAL YA-YA-YAH CORRECT AGE/BIRTHDAY THING
in order of oldest to youngest:
Yamashita Shoon
Birthday: December 20, 1988
Age right now: 18
Will turn: 19 in December 2007
Yabu Kota
Birthday: January 31, 1990
Age right now: 17
Will turn: 18 in January 2008
Yaotome Hikaru
Birthday: December 2, 1990
Age right now: 16
Will turn: 17 in December 2007
Ayukawa Taiyo
Birthday: January 18, 1991
Age right now: 16
Will turn: 17 in January 2008
So Shoon and Yabu are basically only a year apart, and then Hikaru and Taiyo are a year younger than Yabu. Because of the Dec/Jan split, i thought Yabu was closer to the other two, and there was a larger split between Shoon and everybody else, but I was just thinking about birth years, not how late in the year people were born.
I also really really thought that Shoon turned 20 this year, as my brother was born in 87 and turns 21, but Shoon's super late birthday is what screwed everything up in my head. BUT THAT'S OKAY. it just means I can use this icon longer.