I have just been watching the teen boys from across the road (ranging from the age of 13 to 17). Two of them actually live there, the rest just hang around there.
Anyway in this area ALL kids of ALL ages seem to be free to just hang out on their own with whoever they like. So across the road 'hanging out' is also a little boy who is no older than 6 (my son is 7 and this lad looks alot younger). The first thing that made me look was this kid screetching "you fucking turd!" across the street. The sad thing is he still has a little baby voice, it sounded awful. Anyway I've just been watching them all again and this lad was getting his 'willy' out of his trousers and chasing the teens around to 'wipe it' on them. So they're all running around shouting "don't be gay!" and the kid is laughing his head off then one of them said to him "put it through one of the holes in the fence for a laugh" so of course, eager to 'fit in with the big kids' the lad goes and does this he them demonstrates "shagging the fence" (his own words). I swear this kid is 5, 6 years old at the most.
What would you do? the parents around here are NOT approachable unless you're resiliant to baseball bats and bricks etc.