Not so; as you can see in my other comment's link, we can cite OK about 90 years before we can cite "okay", and more reliably than that we can cite the alternative spelling "okeh" to 1919, which establishes pretty well that "okay" was not standard then.
by talking about this you've wasted all the bandwidth your two bytes would have saved a year.
As far as I understand this has been common vernacular since before my lifetime, I'm not usually one to welcome evolution of the base language but this one is before our lives we need to let it be.
