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While there certainly exist tons of examples of comedians gone aged and terrible, I still think it's worth noting the people who were ONCE comedians and continue to be edgy and provocative, but in other media: the already mentioned Steve Martin-as-writer is a good example, but I think a better one is Mike Nichols. "The Graduate" "Closer" wasn't, but it was a helluvalot better than "Match Point." Maybe shifting to other venues can help stave off the dry-rot: and I don't mean "other venues" like hosting the Oscars, I mean ones that require actual work.