I've got my ww folder thing from 2004 and all my recipe books, all my SW books and guides as well as various other diet books (Atkins etc)
I'd never chuck anything out - sometimes a change is as good as a rest. But that's just me!
I still have my old WW folder, as do I with all my slimming world books and files and my Cambridge diet books Im not throwing any of them out, you never know when they may come in handy !