There is nothing like old jews telling jokes. I am sorry if it sounds racist, but as someone who is both from jewish origin and getting old I can say these kind of things. But it is true, there is something in the delivery, in the body language, in the half silly half witty humor that is part of the heritage, part of the culture.
Just to prove that this is not just my opinion, here are some samples from a project called, you have guessed it, "old jews telling jokes". I have to warn you in advance that a. these are stupid jokes that no one in his right mind would laugh to and b. you will laugh so hard you will wet your pants.