~3. At 18mths she watched Moana and showed high emotional sensitivity to certain scenes and we would stop as well.
And it's not just bad guys, but general drama, right? Like a character being sad. I tried playing A Bug's Life 3 months ago, and she lasted all but 5 minutes, when the protagonist's machine misbehaves and is mocked by the rest.
Moana is intense! We had to leave the theater when our kiddo got scared.