user19880: 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.

user4418: Running queries against rating data downloaded from the FIDE rating data download page gives the following average standard, rapid and blitz ratings for players with the GM title over 50 and under 50:
50+ Std=2441 Rpd=2428 Blz=2412
U50 Std=2532 Rpd=2521 Blz=2515
Surprisingly that looks like no real difference to me.
GMs over 50 are understandably, on average, weaker than GMs under 50 but both sets are fractionally better at standard than rapid and fractionally better at rapid than blitz.
I tried checking for U30's and got:
U30 Std=2575 Rpd=2535 Blz=2538

19880: <p>As GMs age beyond their prime, their ratings will likely drop in Classical, Rapid and Blitz chess.</p>
<p>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?</p>
<p>(I am asking specifically about GMs because I believe that age would be a limiting factor only in the highest levels of play.)</p>
<hr />
<p>This question was inspired by the following amazing achievements:</p>
<p><a href="https://web.archive.org/web/20070104211554/http://www.fide.com/ratings/toparc.phtml?cod=105" rel="nofollow noreferrer">In January 2007, Viktor Korchnoi was ranked #85 in the world</a> at <strong>Classical</strong> chess, at age 75.</p>
<p><a href="https://en.wikipedia.org/wiki/World_Rapid_Chess_Championship_2021#Open_tournament_results" rel="nofollow noreferrer">Boris Gelfand achieved 22nd place</a> in the World <strong>Rapid</strong> Chess Championship 2021, at age 53.</p>
<p><a href="https://www.youtube.com/watch?v=dSHm2didVVM" rel="nofollow noreferrer">Anatoly Karpov nearly defeated Spanish IM/GM Rey Enigma</a> at <strong>Blitz</strong> chess in 2021, at age 70.</p>
 4418: <p>Running queries against rating data downloaded from the <a href="https://ratings.fide.com/download.phtml" rel="nofollow noreferrer">FIDE rating data download page</a> gives the following average standard, rapid and blitz ratings for players with the GM title over 50 and under 50:</p>
<p>50+ Std=2441 Rpd=2428 Blz=2412<br />
U50 Std=2532 Rpd=2521 Blz=2515</p>
<p>Surprisingly that looks like no real difference to me.</p>
<p>GMs over 50 are understandably, on average, weaker than GMs under 50 but both sets are fractionally better at standard than rapid and fractionally better at rapid than blitz.</p>
<p>I tried checking for U30's and got:</p>
<p>U30 Std=2575 Rpd=2535 Blz=2538</p>
