Later in life, most of these gifted kids were total disappointments. I know I am.
If the expectation was that I would end up saving the world or something then sure I'm a disappointment, but I like to think I've gotten pretty far considering where I started.
Anyway, of the all the gifted children studied, many of them went to be fairly accomplished but never became anything noteworthy -- doctors, lawyers, teachers, researchers, etc..
However, two of the children that didn't meet the cut for the study due to not having a high enough IQ actually went on to win a Nobel Peace Prize separately in separate fields. Those two individuals were Luis Alvarez and William Shockley.
I wouldn't say I was a disappointment, but I certainly didn't go as far as even the "smart" kids from my own graduating class. I know many of them are "real" engineers working for companies we all know and doing important work in hardware, architecture, civil projects, and aerospace. I feel dumb compared to them.
At the same time, I have a successful career in software, no debt, happily married for almost 10 years, moved to a different continent, etc etc. Sure, am I "smarter" than the average Joe? I guess, but knowing that information doesn't change anything about my life. If I took a real IQ test, I think I would also feel some sort of disappointment or pressure to live up to expectations or better myself in some way.
Idk; I guess that's why I made my original comment. The utility of knowing your IQ is "above average" is so useless to me, I'm not sure why anyone would want to knowingly saddle themselves with that knowledge. Be free, be happy, and be yourself.
I've read some conjectures that IQ is quite accurate below average, but seems to fall apart rather quickly the further one starts looking at scores above 100. But who knows? I'm just some random dude with Internet access.