For any player who grew up in the United States, it is quite easy to pull up their entire tournament history on the USCF website and parse the data. First, an overview of Fabiano Caruana's progress as a youngster. You'll find nothing earth-shattering here. Nobody will be surprised that Caruana started young, played a lot of chess as a kid, and that his rating shot up quickly. Keep in mind these are USCF ratings which tend to be slightly higher than FIDE.