Excellent, but that ending... /spoilers/
I really enjoyed this film, up until the ending. That left me scratching my head a little bit. I understood how the children were surviving, but I don't understand what it all means, thematically-wise. Is it "move away old people, it's time for the kids to take over"? If that's it, it certainly was subtle about it, even with the old couple fitting with the "message", if that's really it.
Otherwise it was an excellent, enjoyable triller, but the ending really had me going "huh!?".