Digimon Tamers/Appendices/Ages and grades

Episode 1

 * Takato Matsuda: Yodobashi Elementary School,class 5-2
 * Juri Kato: Yodobashi Elementary School, class 5-2

English

 * Takato Matsuki: 12

Toei Animation official site

 * Takato Matsuki: 10
 * Ruki Makino: 10
 * Jianliang Lee: 10
 * Juri Kato: 10
 * Ryo Akiyama: 14
 * Hirokazu Shiota: 10
 * Kenta Kitagawa: 10
 * Shaochung Lee: 7

About Characters (English Version)

 * Takato Matsuda (Takato Matsuki): Ja: 10 / En: 13
 * Ruki Makino (Rika Nonaka): Ja: 10 / En: 13
 * Jianliang Lee (Henry Wong): Ja: 10 / En: 13
 * Juri Kato (Jeri Kato): Ja: 10 / En: 13
 * Hirokazu Shiota (Kazu Shioda): Ja: 10 / En: 13
 * Kenta Kitagawa: Ja: 10 / En: 13

Casting list

 * Takato Matsuda: 10
 * Jianliang Lee: 10
 * Ruki Makino: 10
 * Juri Kato: 10
 * Hirokazu Shiota: 10
 * Kenta Kitagawa: 10
 * Shaochung Lee: 07
 * Ryo Akiyama: 14
 * Mitsuo Yamaki: 32
 * Reika Ohtori: 26
 * Megumi Onodera: 23
 * Takehiro Matsuda: 41
 * Yoshie Matsuda: 35
 * Jiang-yu Lee: 40
 * Mayumi  Lee: 42
 * Liánjié Lee: 17
 * Jiālíng Lee: 15
 * Rumiko Makino: 28
 * Seiko Hata: 49
 * Nami Asanuma: 26

Episode 01

 * Takato Matsuda: 10
 * Jianliang Lee (Lee-kun): 10
 * Ruki Makino: 10
 * Nami Asanuma: 26
 * Hirokazu Shiota: 10
 * Juri Kato: 10
 * Takehiro Matsuda: 41
 * Yoshie Matsuda: 35
 * Shaochung Lee: 07

Episode 02

 * Takato Matsuda: 10
 * Jianliang Lee (Lee-kun): 10
 * Ruki Makino: 10
 * Nami Asanuma: 26
 * Hirokazu Shiota: 10
 * Juri Kato: 10
 * Kenta Kitagawa: 10
 * Seiji Kurosawa: 25
 * Tetsuya Iwamoto: 25
 * Toshiaki Mori: 25
 * Takehiro Matsuda: 41
 * Yoshie Matsuda: 35
 * Man of the net management bureau: 32
 * Same / Woman: 26
 * Lovers at the Central Park / Man: 27
 * Same / Woman: 23

Episode 03

 * Takato Matsuda: 10
 * Jianliang Lee (Lee-kun): 10
 * Ruki Makino: 10
 * Nami Asanuma: 26
 * Hirokazu Shiota: 10
 * Juri Kato: 10
 * Kenta Kitagawa: 10
 * Takehiro Matsuda: 41
 * Yoshie Matsuda: 35
 * Shaochung Lee: 07

Episode 07

 * Takato Matsuda: 10
 * Jianliang Lee (Lee-kun): 10
 * Ruki Makino: 10
 * Nami Asanuma: 26
 * Juri Kato: 10
 * Takehiro Matsuda: 41
 * Yoshie Matsuda: 35
 * Shaochung Lee: 07
 * Seiko Hata: 49
 * Mitsuo Yamaki: 32
 * Reika Ohtori: 26

Episode 13

 * Takato Matsuda: 10
 * Jianliang Lee (Lee-kun): 10
 * Ruki Makino: 10
 * Juri Kato: 10
 * Nami Asanuma: 26
 * Hirokazu Shiota: 10
 * Kenta Kitagawa: 10
 * Shaochung Lee: 07
 * Jiang-yu Lee: 40
 * Mayumi Lee: 42
 * Jiālíng Lee: 15
 * Liánjié Lee: 17
 * Mitsuo Yamaki: 32
 * Reika Ohtori: 26
 * Megumi Onodera: 23

Episode 14

 * Takato Matsuda: 10
 * Jianliang Lee (Lee-kun): 10
 * Ruki Makino: 10
 * Juri Kato: 10
 * Hirokazu Shiota: 10
 * Kenta Kitagawa: 10
 * Mitsuo Yamaki: 32
 * Reika Ohtori: 26
 * Megumi Onodera: 23

Episode 23

 * Takato Matsuda: 10
 * Jianliang Lee: 10
 * Ruki Makino: 10
 * Hirokazu Shiota: 10
 * Kenta Kitagawa: 10
 * Juri Kato: 10
 * Takehiro Matsuda 41
 * Yoshie Matsuda: 35
 * Rumiko Makino: 28
 * Seiko Hata: 49
 * Mitsuo Yamaki: 32
 * Reika Ohtori: 26

Episode 24

 * Takato Matsuda: 10
 * Jianliang Lee (Jian): 10
 * Ruki Makino: 10
 * Hirokazu Shiota: 10
 * Kenta Kitagawa: 10
 * Juri Kato: 10
 * Nami Asanuma: 26
 * Takehiro Matsuda: 41
 * Yoshie Matsuda: 35
 * Jiang-yu Lee: 40
 * Shaochung Lee: 7
 * Rumiko Makino: 28
 * Seiko Hata: 49
 * Masahiko Kato: 46
 * Shizue Kato: 33
 * Masahiko Kato: 3
 * Mitsuo Yamaki: 32
 * Reika Ohtori: 26

Episode 34

 * Takato Matsuda: 10
 * Jianliang Lee: 10
 * Ruki Makino: 10
 * Juri Kato: 10
 * Hirokazu Shiota: 10
 * Kenta Kitagawa: 10
 * Shaochung Lee: 07
 * Jiang-yu Lee: 40
 * Mitsuo Yamaki: 32
 * Reika Ohtori: 26
 * Megumi Onodera: 23

Episode 35

 * Takato Matsuda: 10
 * Jianliang Lee: 10
 * Ruki Makino: 10
 * Juri Kato: 10
 * Hirokazu Shiota: 10
 * Kenta Kitagawa: 10
 * Shaochung Lee: 07
 * Ryo Akiyama: 14
 * Jiang-yu Lee: 40
 * Mayumi Lee: 42
 * Liánjié Lee: 17
 * Jiālíng Lee: 15
 * Mitsuo Yamaki: 32
 * Reika Ohtori: 26
 * Megumi Onodera: 23

Episode 41

 * Takato Matsuda: 10
 * Jianliang Lee: 10
 * Ruki Makino: 10
 * Juri Kato: 10
 * Hirokazu Shiota: 10
 * Kenta Kitagawa: 10
 * Shaochung Lee: 07
 * Ryo Akiyama: 14
 * Mitsuo Yamaki: 32
 * Reika Ohtori: 26
 * Megumi Onodera: 23
 * Dolphin (Rob McCoy): 50
 * Babel: 36
 * Daisy: 40
 * Kālī: 43
 * Takehiro Matsduda: 41
 * Yoshie Matsuda: 35
 * Jiang-yu Lee: 40
 * Mayumi Lee: 42
 * Rumiko Makino: 28
 * Seiko Hata: 49
 * Hajime Kato: 46
 * Shizue Kato: 33
 * Masahiko Kato: 3
 * Hirofumi Shiota: 38
 * Takako Shiota: 39
 * Shunsuke Kitagawa: 48
 * Akemi Kitagawa: 43

The script mistakenly addresses Shunsuke and Akemi as Hirokazu's parents, and Hirofumi and Takako as Kenta's parents, but given the appearances of the characters, we can infer the names and ages are correct.

Episode 44

 * Takato Matsuda: 10
 * Jianliang Lee: 10
 * Ruki Makino: 10
 * Juri Kato: 10 (False)
 * Alice McCoy: 10
 * Mitsuo Yamaki: 32
 * Reika Ohtori: 26
 * Megumi Onodera: 23
 * Dolphin (Rob McCoy): 50
 * Babel: 36
 * Daisy: 40
 * Kālī: 43
 * SHIBUMI (Gorou Mizuno): 42
 * Takehiro Matsduda: 41
 * Yoshie Matsuda: 35
 * Jiang-yu Lee: 40
 * Mayumi Lee: 42
 * Rumiko Makino: 28
 * Seiko Hata: 49

Episode 49

 * Takato Matsuda: 10
 * Jianliang Lee: 10
 * Ruki Makino: 10
 * Juri Kato: 10
 * Mitsuo Yamaki: 32
 * Reika Ohtori: 26
 * Megumi Onodera: 23
 * Dolphin (Rob McCoy): 50
 * Babel: 36
 * Daisy: 40
 * Kālī: 43
 * SHIBUMI (Gorou Mizuno): 42
 * Takehiro Matsduda: 41
 * Yoshie Matsuda: 35
 * Jiang-yu Lee: 40
 * Mayumi Lee: 42
 * Rumiko Makino: 28
 * Seiko Hata: 49
 * Kai: 10
 * Johnny Beckenstein: 51

Episode 50

 * Takato Matsuda: 10
 * Jianliang Lee: 10
 * Ruki Makino: 10
 * Juri Kato: 10
 * Kenta Kitagawa: 10
 * Shaochung Lee: 07
 * Ryo Akiyama: 14
 * Mitsuo Yamaki: 32
 * Reika Ohtori: 26
 * Megumi Onodera: 23
 * Dolphin (Rob McCoy): 50
 * Babel: 36
 * Daisy: 40
 * Kālī: 43
 * SHIBUMI (Gorou Mizuno): 42
 * Takehiro Matsduda: 41
 * Yoshie Matsuda: 35
 * Jiang-yu Lee: 40

Episode 51

 * Takato Matsuda: 10
 * Jianliang Lee: 10
 * Ruki Makino: 10
 * Juri Kato: 10
 * Kenta Kitagawa: 10
 * Shaochung Lee: 07
 * Ryo Akiyama: 14
 * Mitsuo Yamaki: 32
 * Reika Ohtori: 26
 * Megumi Onodera: 23
 * Dolphin (Rob McCoy): 50
 * Babel: 36
 * Daisy: 40
 * Kālī: 43
 * SHIBUMI (Gorou Mizuno): 42
 * Takehiro Matsduda: 41
 * Yoshie Matsuda: 35
 * Jiang-yu Lee: 40
 * Nami Asanuma: 27
 * Miki Nakajima: 10
 * Ayaka Itou: 10

Makino family

 * Rumiko Makino: "A very young mother, she gave birth to Ruki at age 18."
 * Seiko Hata: "Despite being almost 50-years old, she's very healthy."

Ayaka Itou
"Juri's friend from class 5-2."

Miki Nakajima
"Juri's classmate."

Digimon Series Memorial Book: Digimon Animation Chronicle

 * Takato Matsuda: Yodobashi Elementary School, class 5-2
 * Jianliang Lee: Yodobashi Elementary School, class 5-1
 * Juri Kato: "A girl from Takato's class."
 * Hirokazu Shiota: "Takato's classmate [...]"
 * Kenta Kitagawa: "Takato's classmate [...]"
 * Shaochung Lee: "Age 7."
 * Takato's classmates: Tadashi Nakabayashi, Taizou Aoyama, Yuuji Terayama, Ayaka Itou, Miki Nakajima, Juri's friend

The Runaway Digimon Express

 * Ruki Makino: Flashback design, "[...] 3 years old Ruki."