The best young player today, by a wide margin, is Erdogmus. [1] He's not only the youngest grandmaster in the world, but showing an arguably unprecedented level of talent. He's 14 and his rating is 2669. Magnus is 2840. Chess ratings are difficult to explain, even to chess players - who might not appreciate how much harder improvement becomes at higher levels.

Suffice to say that 50 points is considered a major edge, and it increases exponentially so 100 points is much more of an edge than 2x a 50 point edge. Here [2] is a rating expectation calculator. If Erdogmus and Carlsen played a best of 10 match, Carlsen would be expected to win 97% of the time, draw 2% of the time, and lose less than 1% of the time.

[1] - https://en.wikipedia.org/wiki/Ya%C4%9F%C4%B1z_Kaan_Erdo%C4%9...

[2] - https://wismuth.com/elo/calculator.html#rating1=2669&rating2...