The "Old School" as defined by adherents is really only a couple of years old (the style isn't, but the pretense that this is how everybody played D&D in the old days is). In the actual dawning days of gaming, people played in a whole bunch of different ways. It isn't really a more authentic way of playing OD&D. Skip Williams is an example of a guy who played back in the old days according to a philosophy that the self-described "Old School" pretty much despises.
Personally, I'd prefer it if the play style was divorced from the idea that it's linked to a particular edition of D&D. I plan on running Pathfinder with traits that are called "Old School."