More to the point on younguns with high iRatings is straight-up physiology. The human body declines in reflexes with age at a pretty significant rate. It's not chance or burnout that makes a 30 year-old NFL player considered "old".
George Sandman is said to be 50+ (iRating over 5000). Given statistics on physiolocical decline proportional to age - even with factoring in the considerable experience and learning assumed in all those years - he would likely be among the very top (6000+) if he was still in his spry 20s.
Now me... I was still slow at 24 or so when I started sim racing and have only gotten marginally less so with practice and experience in my mid 30s.

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