Stumbling across your own outdated, legacy content on search engines can be a...

https://stateofseo.com/should-i-301-redirect-old-urls-or-leave-a-404-the-reality-of-content-decay/

Stumbling across your own outdated, legacy content on search engines can be a headache for your brand’s authority. Often, this happens because of aggressive web caching that keeps forgotten pages alive long after you’ve updated your site