Just saw a tweet from Ben Zimmer about a Google tool that lets you search book databases for keyphrases and keywords. So, with "seasoned professional" fresh in my mind, I did a search for it.
A chart of its occurrence shows a steady and marked increase in its use since the late 1920s until its sudden dropoff in the 2000s! I guess those two words are sick of each other, too.
I like this search engine. I like it a lot.