Typical Spanish village where Caminos go through may look decent sized, with impressive church, well maintained medieval walls, albergues, restaurants, bars, etc, but actually have just a few dozens of adults living there who mostly have Camino related jobs (or that village would be abandoned ruins like so many others that you can buy for peanuts in Spain) and less than 10 children in total who go to school in another village. But there usually are lots of locked houses whose owners live and work in Madrid and come over during vacations, longer holidays that quite often are "bridged" to the closest weekend. Those may bring more children to play in the playgrounds.