For those who (like me) sometimes get a little confused.
This list works as: American name/Japanese name.

Adventure 01
Tai Kamiya [11]/Yagami Taichi [11]
Hikari Kamiya [8]/Yagami Hikari [8]
Matt Ishida [11]/Ishida Yamato [11]
Sora Takenouchi [11]/Takenouchi Sora [11]
Joe Kido [12]/Kido Jyou [12]
Mimi Tachikawa [10]/Tachikawa Mimi [10]
Izzy Izumi [10]/Izumi Koushiro [10]
TK Takaishi [8]/Takaishi Takeru [8]

Adventure 02
Davis Motomiya [12]/Motomiya Daisuke [11]
Yolei Inoue [13]/Inoue Miyako [12]
Cody Hida [9]/Hida Iori [9]
TK Takaishi [12]/Takaishi Takeru [11]
Hikari Kamiya [12]/Yagami Hikari [11]
Ken Ichijoji [12]/Ichijoji Ken [11]

Tai Kamiya [15]/Yagami Taichi [14]
Matt Ishida [15]/Ishida Yamato [14]
Sora Takenouchi [15]/Takenouchi Sora ([14]
Joe Kido [16]/Kido Jyou [15]
Mimi Tachikawa [14]/Tachikawa Mimi [13]
Izzy Izumi [14]/Izumi Koushiro [13]

Also, Digimon Emperor/Digimon Kaizer
DigiDestined/Chosen Children


This information comes from Absolute Anime. ..I'm not so sure about the ages. If anyone has any corrections, let us know ^,^.

Wow there's not much of an age differance at all.
But the name differance is qiet allot for some of them.

Don't forget that the Japanese names are written Last Name (Yagami) First Name (Taichi).
Unlike the American which is First Name (Tai) Last Name (Kamiya).