When I went into library school I was looking for an easy job. And since I loved reading, I thought I would get to do a lot of that and get paid for it.
Librarians do get to read.
Such thrilling tomes as the Library of Congress Subject Headings, AACR2, Dewey Decimal Classification System, and other such works. I learned that librarians often have to make time for their pleasure reading. Well you get the idea. Below are some links to sites that may help you understand why there are so many gray haired and bald librarians. The largest and most wide reaching of a host of library associations.