I've made sure I've always got at least two kids at all times, preferably more. As soon as I notice a kid is 11 or 12 at the latest I'll make sure that one of the villagers has a baby as a replacement for when the kid reaches 14 and can't hunt for mushrooms and collectibles any more.
The game is well-named: it's much more about the children than VV1. In that, children mostly just got in the way apart from the accasional mushroom. It's also good fun to watch them zooming about, playing tag, going to lessons, watching the work going on, or just sitting feeling lonely.
