Well I be darned. You learn something new every day. I am thumbing through my 95' Awake bound volume and I have noticed that the masthead did change. From the Nov. 8th issue onward, they did away with the part that says "before the generation that saw the events of 1914 passes away".
I believe that during that time, new "light" was shed on the understanding of that "generation". More likely the reason they changed the wording.