Can't be something you just learned Sylvie, that black don't crack saying is probably older than you and me.
Have to say though, Caroline Kennedy was born two weeks before I was in the same hospital, my mother was already there due to complications, so everytime she or her family were on TV I always heard that story ad nauseum. So when I finally saw her in person about two years ago I was absolutely gobsmacked, we all meet that one person that we went to school with or something that looks a hundred years old, well . . . ol' Caroline totally gobsmacked me, other folks I still run into black and white don't look as wrinkled and aged as she does.