One thing to remember is that it's a very long show, right around 3 hours long. Most kids I know wouldn't sit there that long.
Charley, the forums youngest member (as far as I'm aware) will be going to a couple of shows next Spring with her Dad, Uncle Keats and Gramps (me). She's been to 4 shows previously. Beaulieu, Liverpool Pops, Folkestone and Bournemouth. Most APF shows run to about 2 hours 45 minutes, including the interval, and we've had no problems up to now with her getting restless. Quite the reverse actually. Even at the tender age of 8 going on 9 she gets into the Floyd zone and is totally absorbed - sings her little heart out and plays air drums along with Bonney!! ;D
As far as APF shows being suitable for youngsters - my family are more than happy to rely on the band and management to set the boundary of good and bad taste at their shows and we're confident that they would never embark on anything in the production which would overstep the mark.
Anyone considering taken youngsters to a show will have to make their own decision of course, and although I have yet to see TAPFS playing The Wall, I would respectfully suggest that there is no cause for concern.