well, okay, a LITTLE bit of it was specific years - 1968 (the "year of protests") because that year did cause a major shift and so did 1993 (the web)
Discussion
late 20s because much of the tech and science we continue to use emerged in the early 30s and late 70s because some of the first digital stuff began to get some adoption then - early home computers but also the first digitally recorded album - an ABBA record - around 1975.