Yes, they're all adults. The ages go like this;
22-Joe
21-Matt, Tai, Sora, and possibly Izzy
20-Mimi, and possibly Izzy (you see I'm a little confused about the ages)
deceased-T.K. and Kari (Um...*_*;; sorry about that)

The Sims

Yamato "Matt" Mon
Taichi "Tai" Mon
Jyou "Joe" Mon
Izzy Koushiro Mon
Mimi Mon
Sora Mon

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