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