The term "grandparent" can imply any number of decades: mine were born in the 1880s and 1890s before the airplane and only two of them barely lived long enough to hear the term "computer" as applied to a mechanical computers in the modern sense of the word. Their parents (my great-grandparents) could not have imagined anything like a computer.

You're better off specifying a couple of decades and asking about how older people made that transition - if at all.