Heh, iMon cut right to the chase.
And if you allow the offtopic, I've also been wondering about that. Adventure's set in 1999 (when Taichi would be 11) and the second season set in 2002 (hence 02) so Taichi should really be 14 by a three-year difference. Strange that they would change the ages in dub, though. Turning the new generation even just one year older would force Miyako to be in middle school/junior high.