youthquake

noun

1. (informal)A noticeable shift in society or culture in response to the activities or tastes of younger members of the culture.

   “Britain produced many of the first temblors of the youthquake. There were the elegantly dressed but often vicious Teddy boys of the late 1950s. There were the gentler Mods and the tough leather-jacketed, working-class rockers in the '60s.”

   “The trend was partly a manifestation of the Silicon Valley youthquake that was powering the dot-com economy.”