Oldest living GM

Unless I screwed up my research, it's Aleksandar Matanović from Serbia (aged 91). GM Nikolai Krogius is also 91, but a bit younger.

en.wikipedia.org/wiki/Aleksandar_Matanovi%C4%87
en.wikipedia.org/wiki/Nikolai_Krogius

Kortchnoï lived old too

Already rip

Potential "oldest living GM", in the near future:

Born in 1932 and living:
Juraj Nikolac – en.wikipedia.org/wiki/Juraj_Nikolac
Yair Kraidman – en.wikipedia.org/wiki/Yair_Kraidman

Born in 1933 and living:
Nikola Padevsky – en.wikipedia.org/wiki/Nikola_Padevsky

Born in 1934 and living:
Klaus Darga – en.wikipedia.org/wiki/Klaus_Darga

Born in 1935 and living:
Oscar Panno – en.wikipedia.org/wiki/Oscar_Panno
Friðrik Ólafsson – en.wikipedia.org/wiki/Fri%C3%B0rik_%C3%93lafsson

Born in 1936 and living:
Burkhard Malich – en.wikipedia.org/wiki/Burkhard_Malich

Born in 1937 and living:
Enver Bukić – [no Wikipedia page]
Boris Spassky – en.wikipedia.org/wiki/Boris_Spassky
Lajos Portisch – en.wikipedia.org/wiki/Lajos_Portisch

Born in 1938 and living:
Igor Zaitsev – en.wikipedia.org/wiki/Igor_Zaitsev
Dražen Marović – en.wikipedia.org/wiki/Dra%C5%BEen_Marovi%C4%87

Born in 1939 and living:
Hans-Joachim Hecht – en.wikipedia.org/wiki/Hans-Joachim_Hecht
Ivan Radulov – en.wikipedia.org/wiki/Ivan_Radulov

Born in 1940 and living:
Juzefs Petkēvičs – en.wikipedia.org/wiki/Juzefs_Petk%C4%93vi%C4%8Ds
Miodrag Todorčević – en.wikipedia.org/wiki/Miodrag_Todorcevic

Yuri Averbakh
100 years old

@Kriegerkind2020

In Memoriam: Yuri Averbakh, 1922-2022
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Erratum: Enver Bukić *died* in 2017, according to his profile on ChessGames.com

P.S.: GM Matanović has contributed to Opening Theory (!) – there's something called "Matanović Attack" in the Scheveningen Sicilian.
Source: www.chess.com/openings/Sicilian-Defense-Open-Scheveningen-Matanovic-Attack