You'd get a pickup game going in the street, or go to some open field, or even vacant lot. The kids would choose teams, and if it looked like the game would get out of hand, they'd re-pick. Calls were disputed but generally the kids figured it out. Kids would start around 10 in the morning, and go until sunset (except for maybe lunch).
Now, they won't let kids play in vacant lots or open fields due to "lawsuits". The kids have to be "coached" by a "trained coach". A kid has maybe 1-2 hours 2 days a week to play the game. They may "work on their skills", but the only way you get better is to play the game.
Basketball is the only sport kids play nowadays at the drop of a hat. Football used to be like that, but that's been taken over by the lawyers as well. In Central and South America, Africa and Europe, kids will play soccer at the drop of a hat...ie, put a few rocks out for out of bounds and for goals, and just play. Here in America, you have to be tricked out in the latest gear, or you can't play (thanks to the lawyers who sue).