HK"s points are spot on (naturally!). I'm a professional educator who was specifically involved in gifted ID in a moderately large district for many years, and the main reason I have encountered multiple PG individuals is childhood association with a nationally-known program for such. And a PG sib.

There's a lot of pressure for GT individuals to hide socially. How many times in my life have I heard someone say to me or my children, "You're so normal!"

...pronounced like the long vowel and first letter of the alphabet...