Yes, I just moved and it's true. I spent 6 months taking books to old folks homes, the Salvation Army, anybody who would take them. At one point we had the living room, the den, the bedrooms and the garage walls covered with books. They're nice to have in middle age and when you have children, but after that, it is liberating to let them go.
The local libraries have been modernized,computerized,upsized.....and are open fewer hours with twice the staff of my younger days. Donated books go straight to the book sale or trash if some body doesn;t like the subject matter. Gotta make sure no non-PC books are shelved. New ,empty shelves in expanded building and more books discarded every year.
Sad.