There can be a lot of discomfort over depictions of child endangerment in film, TV, and video games. Batman: The Animated Series
had to depict Robin as an 18-year-old in college because FOX wouldn't let him be any younger -- although in the later Batman shows on Kids' WB and Cartoon Network, they were able to get away with younger Robins because the censorship wasn't as strict there. Still, maybe the movie studio was more uneasy with the prospect. With a cartoon, it's easier to accept that it's fantasy, but in a live-action movie, there could be fears that it could inspire imitation and draw lawsuits to the studio.