That reminds me of an interview with John Cleese where he said something along the lines of "I don't laugh as much as I used to. As I get older, I find that I'

That reminds me of an interview with John Cleese where he said something along the lines of "I don't laugh as much as I used to. As I get older, I find that I'm coming across fewer and fewer novel jokes, novelty (to the listener) being a critical part of making things funny." Getting old means you've seen lots of things. If all those things have created a consistent mental model, it's much easier to ignore the one, new outlier that contradicts the rest.