Re:On Being Smart (2009) [pdf]
by JoeAltmaier on Thursday November 12, 2015 @11:25AM
(#10554102)
This is exactly the demographic of Mensa: the highly intelligent non-achiever. For probably just the reasons you lay out.
As you get older, the only way to sustain that sort of advantage is to work hard at things you're not good at, but that requires stepping outside your comfort zone. Which is unpleasant. And additionally so if you had "innate ability" when you were younger (which I think is usually more about exposure than people realize).