As GMs age beyond their prime, their ratings will likely drop in Classical, Rapid and Blitz chess.
If we compare the mean Elo ratings of older and younger GMs across all 3 time controls, does it show the same decrease or are certain time controls affected more?
(I am asking specifically about GMs because I believe that age would be a limiting factor only in the highest levels of play.)
This question was inspired by the following amazing achievements:
In January 2007, Viktor Korchnoi was ranked #85 in the world at Classical chess, at age 75.
Boris Gelfand achieved 22nd place in the World Rapid Chess Championship 2021, at age 53.
Anatoly Karpov nearly defeated Spanish IM/GM Rey Enigma at Blitz chess in 2021, at age 70.