Kennedy's adult audience had lived through an economic boom they felt was the direct result of education and information. In the 40s millions of Americans received free education and training, either in the military or for skilled war production jobs, and/or were put through college with the postwar GI bill. The 50s saw an economic boom that heavily promoted education as the key to prosperity and national security.
Today's audience thinks it's the smartest, best informed generation in history because pretty much all of human knowledge is available with a few clicks, but instead of exploring that limitless pool spends its free time scrolling through arguments about uninformed opinions and who should be demonized for Liking the wrong posts.