Cute movie, good message
Slow to start for me, but it was a sweet movie. It was refreshing that there was no bullying storyline or gross-out humor. The casting was great, the storytelling smart. The conversation between Timmy and his school counselor on the playground was really satisfying to me - a message of embracing our uniqueness, taking responsibility for our mistakes and learning from them, and adapting to adverse situations.
I say 8+ just because I'm not wholly sure that this movie would hold the interest of younger kids. Also, as other parents have noted, "damn" is used once, in the context of an adult announcing she is "damn proud" of students at a rally. While it didn't bother me, it also was out of place at a school event anyway, so why not just leave it out?
Also, it might matter to parents that the "bad guys" in Timmy's vivid imagination are Russian operatives (whom he refers to as "The Russians" throughout the movie)... that might prompt a conversation about why this villain stereotype is used in movies. And the class pet, a hamster, dies (his stiff, dead body is seen briefly), which might bother littles.