Thread:KrytenKoro/@comment-35109290-20180716165043/@comment-31365078-20181224081625

although the compnay that sell it have this on their page which is what was said on the back (And seems to just translate te JP)

https://www.amazon.co.uk/Digimon-Adventure-Tri-Part-Reunion/dp/B073SS5WXS

"It's been six years since that summer adventure when Taichi Yagami and the rest of the DigiDestined crossed over to the Digital World. And nearly three years have passed since the final battle between Hikari Yagami's group and BelialVamdemon. As the peaceful days passed by, at some point the gate to the Digital World closed. But when a Kuwagamon suddenly appears in Odaiba, its rampage leaves the town in ruins and the people there in turmoil. Taichi chases after it, in an effort to halt its rampage. But there's nothing he can do against a Kuwagamon. Not by himself. And that's where a new adventure begins..."

this source is more accurate

https://www.crunchyroll.com/anime-news/2016/08/04-1/additional-digimon-adventure-tri-english-dub-cast-announced

It's been six years since the summer adventure when Tai (now in high school) and the rest of the DigiDestined crossed over to the Digital World and nearly three years since frenzied final battles between warring factions. With the gate to the Digital World closed, time continues to pass, until theadventure Digivolves once again.

RN this puts dub Tai as 16, though with the year shown as 2005, I'm not sure that can actually be possible so it might be best to put 16 or 17 and say the dubbers forgot the ages are supposed to be different in the dub