Partly inspired by the thread about a loitering child on a driveway, but not a thread about a thread 
I was wondering what other people's views on acceptable boundaries for kids playing out were. I get that there are many types of parenting, and countless variations within those types, so I was curious about how many different viewpoints are represented here with regards to amount if time playing out, ages of kids going out, curfews and distance from home that the kids are allowed to roam as well as expectations of behaviour while they are out.
For my part, I live in a very quiet cul-de-sac in a quite village that is surrounded by farmland and woods. There are several greens nearby and a small play park. My DC have been playing out from about the age of 5 with gradually extending boundaries. From the age of about 9 I have been quite happy for them to be out for 3 or 4 hours at a time (as long as I know where they are and roughly who they are with) and they know to come and let me know if they will be going into someone's house or back garden to play, so I can find them if needs be. They go off on foot or on bike, to play football or whatever card game is the latest craze on the green or over the woods to make dens and scrabble around up trees. That seems to be the average for kids of their age round here, but lately I have noticed that kids of about 6 are having the same degree of 'freedom' now that my 2 did at 9 so I was wondering if the general consensus on what is allowable for playing out has shifted recently, or if I was too PFB with my kids, or indeed if the ones playing out now are just feral neglected souls.
What is the average age by you for an afternoons unsupervised loitering and do you impose any conditions on your little loiterers when they go out?