Content Decay

Content decay is the gradual decline in a page's search rankings, traffic and AI citations over time. It usually happens because the information ages, competitors publish better or newer pages, search behavior shifts, or search engines change how they evaluate the topic. Decay is normal: most pages peak and then fade unless someone maintains them.

Common causes:

• Facts go stale: prices, product specs, regulations, statistics, screenshots.
• Competitors publish more complete or more current answers to the same questions.
• People search with new terms, or the question itself changes.
• Search and AI systems change. A ranking update, a feature such as AI Overviews, or a new model can shift which pages get shown or cited.
• The site creates overlapping pages that split links and attention.

In AI search, decay shows up as lost citations, and it can move faster than classic rankings. Promptwatch followed every page ChatGPT cited on July 6, 2026 for the next 90 days and published the results in October 2026 (ChatGPT content half-life). After 60 days ChatGPT still cited 69% of the landing pages and 67% of the documentation pages, but only about 55% of product pages, reviews and how-to guides. News decayed fastest: half of news pages were no longer cited after 36 days. Product pages lose citations faster than many teams expect, often because prices and availability change.

Not every drop is decay. Platform changes can look the same from the outside. Around the GPT-5.3 rollout on March 4, 2026, the average number of sources per search-enabled ChatGPT response fell from about 6.4 to roughly 4.8, which cut citations across the board (citation drop data). Before rewriting a page, check whether competitors lost citations at the same time, and keep AI answer volatility in mind: answers to the same prompt vary from day to day.

To catch decay early, watch trends per page across three sources: clicks and impressions in Google Search Console, rankings for the page's target queries, and citations for the prompts the page should win. Flag declines that last several weeks rather than single bad days. Then decide page by page. Refresh when the URL still has links and the topic still matters: update facts, add what newer competitor pages cover, and remove what is no longer true. Merge when several pages overlap. Retire and redirect pages whose topic no longer exists. Google's helpful content guidance is explicit that changing a page's date without substantial changes is a warning sign, so a refresh needs real edits. Content freshness covers the maintenance side, and citation decay covers decay measured in AI citations specifically.