From October of 2020 on whatever happened to Gene Hackman.
Gene Hackman Interview: On His Retirement, Acting, And Writing Westerns
He retired from acting back in 2004 at the tender age of 74 for health reasons, particularly anything putting stress on his heart and now in his nineties is enjoying his retirement. He binges on comedies, watching DVD's his Wife rents, as well as hobbies including painting and fishing and most notably, writing Westerns, something he had been doing since a few years before his retirement from acting.
The article itself is fairly biographical of his career as well as his retirement so worth a read itself if your wondering what the canvas for Little Bill/Popeye Doyle/Lex Luthor has been up to.