Thread:KrytenKoro/@comment-35109290-20180716165043/@comment-35109290-20180727202314

https://withthewill.net/threads/12907-Digimon-Adventure-02-and-Frontier-and-the-age-thing/page7 Ok, I found another old reference / discussion post on official ages after searching a bit. It's on With the Will but they did give some sources. "Jō doesn't say he's 11 in the Japanese version, he only says he's in 6th grade. Also, Sora is 14 in 02. The Digimon Series Memorial Book: Digimon Animation Chronicle gives everyone's 02 ages except Takeru's. -Taichi, Yamato, and Sora: 14 -Kōshirō and Mimi: 13 -Jō: 15 -Daisuke, Hikari, and Ken: 11 -Miyako: 12 -Iori: 9

In other words, by Our War Game! Sora has turned 12. It doesn't make sense per the Japanese system, but neither does the movie's date, which is March 4 per all sources even though Japanese spring break is at the end of March."

also "According to one of the books, the movie does indeed take place on March 4."

https://www.tokyo-icc.jp/guide_eng/educ/01.html But, if Koushiro+Mimi are 13 in 02, 7th grade/1st year of Junior high school consists of ages 12~13. Thus, closer to 13 by 02. This would imply their Tri ages to be closer to 16 as well, and possibly closer to 17 by end of Tri / before a sequel. Even if the ages are slightly off real world timing-wise, they appear to match up when comparing with Taichi's official age/grade in Tri as well?