https://books.google.com/ngrams/graph?content=seasick&year_start=1700&year_end=2019&corpus=26&smoothing=1#
Why?
Boomers are one of the least sea sick generations in history, you gotta hand it to them.
The mid-20th century dip is in the early 70s. That's roughly when the dollar is unarmored from the gold standard, thusly turning the post-Bretton Wooods world seasick, adrift, rudderless.
Getting all your friends to come over and bring their PCs so you can play StarCraft and Age of Empires together, and everyone gets LANsick