n: a shift in cultural norms influenced by the values, tastes, and mores of young people.
Etymology: youth + earthquake. First known use: 1966.
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Definition from Merriam-Webster.
P.S. I usually prefer to use thefreedictionary.com for definitions because they do not inundate you with pop-ups; however, I really enjoyed seeing the suggested rhymes that Merriam-Webster offered with the definition of youthquake...
air brake, backache, beefcake, cube steak, handshake, heartbreak, mandrake, partake, uptake and windbreak to name several.