One thing I know for a fact that all old ladies do is forget how to f**king drive. My mother-in-law is 57 and she drives like she's 100, or something. It's ridiculous.
So because one
middle-aged woman drives timidly (at least that's what I'm assuming you mean by "like she's 100"), you "know for a fact" that "all" old ladies forget how to drive. Spare me.