Content decay happens when published content stays the same while the facts, services and language it describes move on. A page that was right when it went live becomes less right over time: a fee goes up, a form is replaced, a team is renamed, a link stops working or the words people use for a topic change.
That sets decay apart from content that was wrong from the start, which is a quality problem at publication rather than a maintenance one. It also explains why decay is easy to miss. A decayed page can still attract traffic, look polished and pass automated checks while directing people towards an expired process or a retired service. Link rot, where links break as pages move or disappear, is one of the most measurable forms. Pew Research Center found that 38% of web pages that existed in 2013 were no longer accessible a decade later.
Why it matters for content
Decayed content damages trust and creates work elsewhere. People contact support, make poor decisions or repeat outdated claims. Search engines and internal systems may keep presenting the page because nobody has marked it as unreliable.
Spotting decay means looking at accuracy as well as traffic. Falling visits can point to a page that no longer matches what people search for, but some of the most harmful decay sits on popular pages. Better clues include support contacts that mention the page, internal searches that land on it and then search again, feedback saying the instructions didn’t work, and changes to the policies, products or prices it depends on. Recording those dependencies lets a team check the right pages when something changes.
Different content decays at different rates. Prices, people and regulations are volatile; an explanation of a method may stay useful for years. A review date set according to that risk catches decay before readers do, and a ROT content audit (redundant, outdated, trivial) finds what slipped through. Some content has finished its useful life, and retiring it is as much a fix as updating it.
How AI changes the picture
Comparing a page with an updated source can help a team find changed requirements or conflicting claims. Broken-link monitoring needs ordinary automation rather than AI; judging whether a changed sentence affects a service needs more context. Flags should point to the evidence so someone can check them.
AI also carries decay further. An assistant may reuse stale guidance without sending readers to the original page, so the error reaches people who never see the page or its date. Review triggers need to cover the content supplied to assistants as well as the pages people visit. Dates and canonical markers can help a system choose between versions when it uses them, but they don’t establish that the claim is still true.
Questions people ask
- Is content decay the same as falling search traffic?
No. Falling traffic can have many causes, including changes to search engines that have nothing to do with the page. A popular page can still contain an expired requirement, so check accuracy and usefulness separately from visits.
- Does adding a new date make content fresh?
A review date should mean someone checked the content against the relevant evidence. Update it if something needs changing, and record a completed review even if the wording is still right. Changing a publication date without doing either is misleading.
- Which content should we check first?
High-use, high-risk and fast-changing material, plus content that feeds services or AI systems. A page that tells people how to apply, what they’ll pay or what they’re entitled to usually deserves attention before a background explainer.
- Can evergreen content decay?
Yes, though more slowly. Even durable ideas need occasional checks for accuracy, examples, links and the terms people now use.
Learn more
- Web content has a maintenance problem – Gerry McGovern’s polemic about the labour of editing, moderation and deletion, challenging claims that cheap generation means cheap content.
- When Online Content Disappears – Pew Research Center’s 2024 study of link rot, finding that 38% of web pages from 2013 had gone a decade later and that around one in five government pages contained at least one broken link.
- How to update old content – Ann Smarty’s search-focused guide to diagnosing and refreshing older articles; practical source and link checks sit alongside marketing tactics.