My great grandmother on my Mom's side lived from 1903 to 2002 in the very rural and mountainous Virginia panhandle, and my grandmother on my Dad's side lived from 1915 until 1995 in various urban and suburban neighborhoods around Columbus and Dayton, Ohio. Despite being from culturally different regions of the country, both of these women never had drivers licenses and they always relied on others for transportation. This always struck me as odd that neither of them ever drove, but my parents claim this was normal for women of their generation. How common was this? What were the reasons for it?
I can't find original sources, but according to this article http://www.usatoday.com/story/money/cars/2012/11/12/women-drivers-men-licenses-roads/1700185/ roughly half of all women had drivers licenses in the 1950s. Currently there are more women than men drivers.
At the risk of further violations of the sub-rules by use of anecdote, both of my grandmothers had drivers licenses. They were born in the 1915 range in Ohio.