Too young grandmasters

A lot of players become Chess Grandmasters at a very young age such as Magnus Carlsen, Judith Polgar and many more. GM Anand Viswanathan even said “Nowadays, when you're not a grandmaster at 14, you can forget about it.” The question is is there any special training pattern and program that these kids use that enable them become grandmasters in a few years. What is the training process and how is it done? It is known that they have chess trainers, but what is the training process like, the curriculum and what one needs to know to become a very strong chess player, grandmaster stregnth? Not sure if there are common denominators to training programs but as far as the environment is conerned, you would commonly see a combination of exceptional natural talent coupled with a disciplined yet nurturing environment of "eat-sleep-breath" chess.