A friend saw Watchman opening weekend and there were 4 and 6 year old children there. Parents who couldn't wait, and couldn't afford a sitter[but they could a movie ticket?!]
Ugh, there were two 6s (around 10-11 years old, I'd imagine) sitting next to me and my husband when we saw Watchmen, too. Made me feel rather uncomfortable. The two young men who were with them (fathers? older brothers?) didn't seem to be the most intelligent individuals I've met, though.