My children also began running about that age, and didn't stop.
However I do think that some children are NOT getting out like they should anymore.
With Television, video games and computers there are children that just don't go physically play very much anymore.
I have a niece who loves to follow the path of least resistance :-).
She would be quite happy NOT being encouraged to go out, although when someone is around to play with her she does go out and have fun.
But.. that being said.. I think your definately right. We have people redoing "guidelines" at the shift in a breeze.
Just think.. they used to say just a 1/2 hour three days a week. Now they want everyone to do an hour a day.. .. and MORE If you need to lose weight.
"They" are starting to drive me nuts!

Poofie!