A new Digimon Adventure anime is in happening to celebrate its 20th Anniversary. Tai and Matt will now be 22 years old in this new anime. As far as we currently know it will be a movies again.
Here are the visuals that can be found on the official Digimon Adventure website of Tai and Matt at age 22.
Supervisor: Seki Hiroshi
Character Design: Katsumi Nakatsuru
Digimon Character Design: Watanabe Kenji
All info can be found on the official website digimon-adventure.net
Hopefully we will get more info on this new project soon!