J.K. Rowling was 55 in Harry Potter 20th Anniversary: Return to Hogwarts when she played the character 'Self (archive footage)'.
That was over 2 years ago in 2022.
Today she is 58, and has starred in 13 movies in total, 1 of those since Harry Potter 20th Anniversary: Return to Hogwarts was released.
In Harry Potter 20th Anniversary: Return to Hogwarts, I think J.K. Rowling looks: