I did think it was pretty funny in the new "The Shark Is Still Working" extra that Lee Fierro "Mrs. Kitner" went around to Jaws related events and people wanted her to slap them which she did for quite a while (slapping montage shown) until she said no more.
I never thought Mrs. Kitner was too old. The only thing she says is "my boy" which means it could be a later birth, could have been adopted, could have been child out of wedlock, the back story is endless.