I've heard from several library staff that having a tech mentor is a valuable resource for learning about computers. For example, take Barbara Keefe, Technology Services/Reference Librarian at the Windham Public Library. One of her patrons, a former IBM employee, taught Barbara (among a number of tech things) how to crack open a computer to upgrade RAM and to wear an ESD wrist strap when working with hardware.
Barbara says she asks her county systems tech a lot of questions too. And he's happy to pass along the knowledge so Barbara can take some of the maintenance tasks to keep their computers healthy.