I couldn't agree more RTL, I think most children of that age could handle it. I would like to bet that there are more graphic killings and mutilations on X Box games.
I think the thing about computer games is children don't really associate the death and gore with real life, it is just a game, and blowing someone's head off is 'fun'. I've seen children who have no qualms about graphic games completely break down when faced with real blood, even from quite minor injuries.
I went to see the film yesterday (Saturday) so it is still fresh in my mind. I do think some under 15's would cope with it, but it would need to be with very careful parental guidance.
At the end of the viewing there were adults leaving the cinema in tears. And total and utter silence in the auditorium and on the way out, unlike the chatter you normally get at the end of a film. People on both sides of me were also jumping in shock fairly frequently, so it was quite an immersive experience.
I remember how shocking the opening scenes of Saving Private Ryan were the first time I watched it. I didn't think I'd ever watch another film with such impact. 1917 certainly equals Private Ryan, and perhaps surpasses it because it takes time to build up to the most dramatic scenes and in that time we start to get to know the characters.
The casualties in the early scenes of Private Ryan were largely anonymous so there was less connection with them. Which I guess is why children can play those computer games without flinching.