Blanche Marvin  (January 17, 1925 – January 13, 2026) was a British theatre critic, producer, writer, actress, and dancer born in the United States, who lived in London for many years.
She was the oldest living notable theatre critic.
Now I don't know who succeeds her.

https://www.nytimes.com/2026/02/04/theater/blanche-marvin-dead.html

Dino Attanasio (real name Edoardo Attanasio; May 8, 1925 – January 17, 2026) was a Belgian-born Italian comic book writer and illustrator.
He was born in Milan.
He was the oldest living notable illustrator, a distinction that passes to the Indian Shivram Dattatreya Phadnis (born July 29, 1925).

https://www.stripspeciaalzaak.be/stripnieuws/dino-attanasio-100-overleden

Jean Cussac (May 31, 1922 – January 25, 2026) was a French baritone and musical director. Born in Paris and died in Gujan-Mestras, France.
He was the oldest living notable baritone and musical director.
I couldn't find who holds that position now.

https://www.bfmtv.com/people/hommage/blanche-neige-merlin-l-enchanteur-les-parapluies-de-cherbourg-jean-cussac-doyen-du-doublage-est-mort-a-103-ans_AN-202601270445.html

Elyakim Schlesinger (November 23, 1921 – February 4, 2026) was a British Orthodox rabbi born in Austria and rosh yeshiva in London. He was an international authority and active as President, Chairman of the Board, and Head of the Rabbinical Council of the Committee for the Preservation of Jewish Cemeteries in Europe. He was the grandson of Moreinu Jacob Rosenheim, one of the founders of Agudath Israel Worldwide.
He was born in Vienna and died in London.
He was the oldest living notable rabbi.
Now the oldest living notable rabbi is Shubert Spero (born September 23, 1923 in New York).

https://www.bhol.co.il/news/1718131

Fredrik August Ehrström (August 29, 1925 – January 21, 2026) was a Finnish sailor. He competed in the Star event at the 1960 Summer Olympics. He was born and died in Helsinki.

He was the oldest living Olympic sailor; that person is now Australian Gordon Wilson Ingate OAM (born March 29, 1926), who competed in the 1972 Summer Olympics, sailing in the Tempest class keelboat.

https://www.olympedia.org/athletes/61912

Birte Christoffersen (March 28, 1924 – February 23, 2026) was a Danish-Swedish diver. She competed in the 3 m springboard and 10 m platform for Denmark at the 1948 Summer Olympics and for Sweden at the 1956 and 1960 Summer Olympics. She won a bronze medal in the platform in 1948 and finished between 8th and 12th place on other occasions. [1] From December 2025 until her death, she was the oldest known living Olympic medalist.
She was born in Copenhagen, Denmark and died in Limhamn, Sweden.
She was the oldest living Olympic medalist, a title now held by Günther Haase, born in Germany on June 11, 1925, also a diver and the oldest living Olympic diver, who won a bronze medal in 1952.

https://www.ratsit.se/19240328-Birte_Ekberg_Limhamn/fZ-tM-u2ifjP2JoK2BQk42EppCrvBg7NRmMyPMhvC10

Song Ping (April 24, 1917 – March 4, 2026) was a Chinese revolutionary and communist politician. He was a member of the Standing Committee of the Politburo. Song was considered the last living member of the second generation of the CCP leadership.
He was born in Ju County, Shandong, Republic of China.
He was the oldest living politician, a distinction now held by the oldest living man in France, Jean Turco (born December 19, 1917), who was a Deputy of the National Assembly for the 14th electoral district of Paris between 1972 and 1973 and then between 1973 and 1978.

https://www.scmp.com/news/china/politics/article/3345438/song-ping-veteran-chinese-communist-dies-aged-108-after-career-spanned-decades

Calvin Tomkins II (December 17, 1925 – March 20, 2026) was an American writer and art critic for The New Yorker magazine.
He was born in Orange, New Jersey, USA and died in Middletown, Rhode Island, USA.
He was the oldest living notable art critic.
I don't know who is now the oldest living notable art critic.

https://www.nytimes.com/2026/03/20/arts/design/calvin-tomkins-dead.html

Natalya Borisovna Vetoshnikova (September 26, 1921 – March 11, 2026) was a Soviet tennis player, Master of Sports of the USSR, USSR champion in singles (1937 and 1939), and doubles (1939).
She was born in Petrograd, RSFSR (Russian Soviet Federative Socialist Republic).
She was the oldest living former tennis player.
Now that person is Australian Henry Young, born on September 26, 1923.

https://tennis-russia.ru/novosti/umerla-natalya-vetoshnikova/

Mani Kumar Chetri (May 23, 1920 – April 5, 2026) was an Indian cardiologist who was director of the West Bengal State Health Services and director of IPGMER and SSKM Hospital in Kolkata. He was an elected member of the National Academy of Medical Sciences and received the fourth highest Indian civilian decoration, the Padma Shri, from the Government of India in 1974.
He was born in Darjeeling, Bengal Presidency, British India and died in Kolkata.
He was the oldest notable living physician (and cardiologist as well, consecutively).
I couldn't find the oldest notable living cardiologist, but the oldest notable physician now is Alice Shepard Cary (born June 2, 1920), born in Gaziantep, Turkey, but living in the USA.

https://medicaldialogues.in/news/health/doctors/pioneer-cardiologist-padma-shri-dr-mani-chhetri-passes-away-at-106-168038

Elisabeth Ann Dentzel (née Waldo; June 18, 1917 or 1918 – March 16, 2026), better known as Elisabeth Waldo, was an American violinist, composer, conductor, and ethnomusicologist.
She was the oldest living notable violinist, I don't know who it is now.
The oldest living notable composer now is Margaret Ferrell Vardell Sandresky (born April 28, 1921) in Macon, Georgia, USA.
The oldest living notable conductor now is the Estonian Hilma Nerep-Mossin (born September 18, 1923 in Tallinn).
As for the oldest living ethnomusicologist, I haven't found one yet.

https://www.seattletimes.com/nation-world/elisabeth-waldo-dies-at-107-fused-indigenous-and-western-sounds/

Roman Rakowski, codename "Grab", "Długi" (March 18, 1924 in Tymowa, died April 19, 2026 in Gdańsk) – Polish Navy commander, veteran cooperative and activist, lawyer; during World War II, scout for the Grey Ranks, officer of the Kedyw ZWZ - AK, participant in Operation "Burza" in Lviv, after the war member of the Freedom and Independence Association and officer of the First General Staff of the Polish Navy. Knight of the Order of Military Virtues.

He was the oldest living notable naval officer, a title now held by Elmer Royce Williams, born April 4, 1925 in Wilmot, South Dakota, USA.

https://www.gdansk.pl/wiadomosci/Zmarl-kmdr-Roman-Rakowski-bohater-AK-dobry-syn-Polski-Mial-102-lata,a,308781

Elisabeth Wilma Burton Kirkby (January 26, 1921 – April 20, 2026), also known as Elizabeth Kirkby, was a British-born Australian politician, actress, broadcaster, producer, director, and screenwriter. She was born in Bolton, Lancashire and died in Morning Bay, New South Wales, Australia.
She was the oldest living notable radio broadcaster, a title now held by Briton Peter Murray James (born September 19, 1925).

https://www.parliament.nsw.gov.au/members/Pages/member-details.aspx?pk=1798

Gordon Wilson Ingate (March 29, 1926 – April 24, 2026) was an Australian sailor who competed in the 1972 Summer Olympics, sailing in the Tempest class keelboat.

He was the oldest living Olympic sailor, a title now held by Kevin Wilson, an Australian born on December 15, 1927, who competed in the 1952 Helsinki Olympics.

https://www.abc.net.au/news/2026-04-26/australian-olympian-gordon-ingate-dies-aged-100/106606892