Having looked up what "PG" means, my brother certainly falls into that category.
He attended a completely normal primary school and then went to the local comp. He excelled sometimes and failed sometimes, and worked hard sometimes and messed about sometimes.
He got an O level equivalent aged about 12/13 from a hobby he did in his own time, but other than that did a normal amount of qualifications in school at the normal ages.
He got the highest mark awarded that year from his university, and rose straight to the top of his profession, and is about to be awarded his third PhD in 20 years, from hobbies he has done in his own time whilst working full time and raising a family.
He is rich and successful, also a kind, funny, happy, securely married, successful involved family man.
And the family an aspect of him is the only relevant bit, as far as we are concerned, the high flying, world class genius bit probably matters at work, but he spends less than half his life there, and home life is so much more important for happiness and satisfaction.
Thank fully the fact that he is one of the great genius's of his era has never ever been in any way the important, or most emphasised or significant aspect of him