I wouldn't call it "millennial" rather than "modern", and not just because I despise the American generation names. I believe impostor syndrome requires both a

I wouldn't call it "millennial" rather than "modern", and not just because I despise the American generation names. I believe impostor syndrome requires both a bright mind, a successful career in a mental labor job (academia, engineering, ...), and exposure to minds that seem brighter. I doubt impostor syndrome is much of a problem in physical labor jobs, as physical labor is easily observed, both by others and by yourself (you can't hide failure in installing a tire on a rim). Higher education, autodidactism through the internet and mental labor jobs are much more wide-spread than they were a generation or two ago. Here in Denmark, education inflation has basically made Ph.D.'s the norm. The extremely filtered connectivity of social networks only showing each others "best side" making them appear perfect, as well as a vast amount of information available on the internet from brilliant scholars making your knowledge seem insignificant, are great catalysts for an inferiority complex. Combine that with an accomplished career, and you have impostor syndrome.