Which age is funnier: 39 or 40?
This is according to comic Jack Benny
Answer: 39. “The age jokes ... didn’t start until he was 55, and a nurse in a sketch asked him his age; he paused and said 36. It got a big laugh, so he remained 36 for the rest of the season. The following year, he was 37; in the next, 38. He decided to freeze at 39, because it’s a funnier number than 40.”
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Garry Giddins, Natural Selection
(2006), p. 33