I imagine kids are more likely to be playing Minecraft than cowboys and Indians: outdoors is a dangerous place. But there's no law that I know of stopping them.
Gone are the days when you opened the door in a morning and the kids disappeared for hours on end. Only came home when they were hungry. They were not encouraged to sit for too long in front of the TV set because they would get 'square eyes'. Now it's all changed. Children no longer play outdoors as much. Instead they are tapping away on their phones or watching some rubbish on tv. Modern life is destroying their social interaction.