By considering average life expectancy and the typical number of jokes a person hears in a year: If you are under the age of 38, odds are the funniest joke you will ever hear is a joke you haven't even heard yet. And if you are over the age of 38, odds are you already know a joke that, to more people than you could possibly meet, might be the funniest joke they will ever hear. So wherever you are, we're glad you're there.