Why would the age of the book matter? If it were from a big publisher and they were to publish a new substantially-unchanged edition every three years, why would that make the library willing to consider the book?
The book in question is still in print and still available new.
If nobody wanted it in the first 10 years it was available, chances are it's only going to get one circulation if they buy it for you. That's not a great use of the libraries purchase budget or shelf space budget.
If they had a copy that wore out and it was circulated many times, they would have reordered it when they discarded it.
Some universities have it, but the only copy in CA public libraries seems to be at the Sharp Park branch in Pacifica (which I believe was acquired in the last couple of years - good on them!).
Berkeley public library has copies of the JS edition for what that's worth..
Also, I'd like to note that in my experience no public library can provision online-only books. I've been unable to get any to acquire Mastering Emacs for example.
Worldcat says it's at 1483 libraries: https://search.worldcat.org/title/Structure-and-interpretati... (although some of them may not participate in ILL, and some may only have eBooks that you probably can't borrow unless you have an appropriate account)
I'm sure SFPL does tracking on ILL requests and if something comes up more than once or twice in a reasonable period and it's available for purchase, a copy will be purchased to add to the collection.
Request physical copies of books you want to read, and that you think are beneficial to the community. And check them out from time to time.
I'm sure a librarian does their best to keep abreast with the latest best books.. but would they know the field better than someone in it?
I've been told they have experts that consult on title selection. But based on the 004-006 section at most libraries, I can only infer that is the IT guy at the senior center..
The book in question is still in print and still available new.