Over the past weekend I learned docker and am now running containers all over the place...these aren't trivial things and the speed of which I'm picking stuff up is as fast, if not faster, then it has ever been for me.
The point is I am 10 years older then the age this study targeted, and I find it humorous that they are telling me I am AT LEAST 25 IQ points dumber because I work 50-60 hour weeks.
Plus, where do I tick the box about my lifetime of pretty hardcore drug use and its supposed effects on my IQ?
Now I do get tired...physically tired...from the efforts required to keep up but besides that, my anecdotal experience goes against this research.