You can take them in at any age with a parent, according to the bbfc website.
Through school etc my kids have learnt of the imminent release of 'Indiana Jones and the Kingdom of the Crystal Skull". They have already seen the other 3 films, and liked them (esp ds (6) ).
They are really keen to see the next film - they are dd1 (8.5), ds(6.5) and dd2 (4.6). But I'm not sure I should be taking a 4yo to a 12 film. The though, however, of her missing out on the same experience of the other 2 is awful - she hates being thought of as too little and has been to several pg films no bother. I have read the plot synopsis on the bbfc website and it doesnt sound like it would bother her. In fact, more likely to scare the other two!
They have all watched 12 films on dvd at home - Spiderman 3, Star Wars:Revenge of the Sith etc. But I wonder if the big screen is worse. Or am I a bad lax mum for letting them see things like this already, or would you take them?