* Mikey: He's supposed to be 11 years old.
* Brand (Data): He's supposed to be 10 years old, a year younger than Mikey.
* Andy (Mouth): This one's a bit trickier. He's supposed to be older than Mikey, but not by much, so probably around 12 or 13.
* Stef (Stef): We don't get a specific age, but she's a year older than Data, so probably 11.
* Chunk: Like Stef, his age isn't explicitly mentioned, but he seems to be in the same age range as Mikey and Data, likely around 11.
Keep in mind, these are just estimations based on the movie's portrayal!