From MS: "...23% for both age groups."
I'm a bit surprised that Millennials are on par with Gen Xers. I would've thought Millennials would be a bit more savvy, due to an extra bit of worldy wisdom, but mainly as they probably had their formative years using more traditional learning methods, eg. pens and real books (ie. not tech reliant). While Gen Xers are unfortunately well conditioned to click through.
The overall problem (?) being that they're (both groups I guess) largely self taught, but from a user's point of view rather than IT oriented. I suppose education wasn't quite well enough established to "save" the Millennials at the time, and the Gen Xers suffer more from Dunning-Kruger as an offset to a more established IT education.