Currently on the declutter. AIBU and wasteful to think that e.g. a 20 year old Rough Guide to London or Paris will be too out of date to be useful (in my opinion), and take it to the charity shop? How long do you keep them? And do you even buy them any more, now that so much info is online?
YABU - London is a historic city and lots of the info will still be useful, you can supplement with the internet for a more up to date guide to what’s happening now
YANBU - so much has changed in that time particularly with the pandemic, and you have the internet/google maps, so get rid of the old guidebooks